Build Dockerfile with recent Sqlite + Spatialite (#280)

Closes #278

```bash
  $ docker run --rm -it datasette spatialite
  SpatiaLite version ..: 4.4.0-RC0	Supported Extensions:
    - 'VirtualShape'	[direct Shapefile access]
    - 'VirtualDbf'		[direct DBF access]
    - 'VirtualXL'		[direct XLS access]
    - 'VirtualText'		[direct CSV/TXT access]
    - 'VirtualNetwork'	[Dijkstra shortest path]
    - 'RTree'		[Spatial Index - R*Tree]
    - 'MbrCache'		[Spatial Index - MBR cache]
    - 'VirtualSpatialIndex'	[R*Tree metahandler]
    - 'VirtualElementary'	[ElemGeoms metahandler]
    - 'VirtualKNN'	[K-Nearest Neighbors metahandler]
    - 'VirtualXPath'	[XML Path Language - XPath]
    - 'VirtualFDO'		[FDO-OGR interoperability]
    - 'VirtualGPKG'	[OGC GeoPackage interoperability]
    - 'VirtualBBox'		[BoundingBox tables]
    - 'SpatiaLite'		[Spatial SQL - OGC]
  PROJ.4 version ......: Rel. 4.9.3, 15 August 2016
  GEOS version ........: 3.5.1-CAPI-1.9.1 r4246
  TARGET CPU ..........: x86_64-linux-gnu
  the SPATIAL_REF_SYS table already contains some row(s)
  SQLite version ......: 3.23.1
  Enter ".help" for instructions
  SQLite version 3.23.1 2018-04-10 17:39:29
  Enter ".help" for instructions
  Enter SQL statements terminated with a ";"
  spatialite>
```

```bash
$ docker run --rm -it datasette python -c "import sqlite3; print(sqlite3.sqlite_version)"
3.23.1
```

Also updates the query used to check for FTS5 as the old version wasn't
detecting FTS5 for some reason.

Dockerfile

@@ -1,21 +1,42 @@
 FROM python:3.6-slim-stretch as build
 
 # Setup build dependencies
-RUN apt update
-RUN apt install -y python3-dev gcc libsqlite3-mod-spatialite
+RUN apt update \
+&& apt install -y python3-dev build-essential wget libxml2-dev libproj-dev libgeos-dev libsqlite3-dev zlib1g-dev pkg-config \
+ && apt clean
+
+
+RUN wget "https://www.sqlite.org/2018/sqlite-autoconf-3230100.tar.gz" && tar xzf sqlite-autoconf-3230100.tar.gz \
+    && cd sqlite-autoconf-3230100 && ./configure --disable-static --enable-fts5 --enable-json1 CFLAGS="-g -O2 -DSQLITE_ENABLE_FTS3=1 -DSQLITE_ENABLE_FTS4=1 -DSQLITE_ENABLE_RTREE=1 -DSQLITE_ENABLE_JSON1" \
+    && make && make install
+
+RUN wget "https://www.gaia-gis.it/gaia-sins/freexl-1.0.5.tar.gz" && tar zxf freexl-1.0.5.tar.gz \
+    && cd freexl-1.0.5 && ./configure && make && make install
+
+RUN wget "https://www.gaia-gis.it/gaia-sins/libspatialite-4.4.0-RC0.tar.gz" && tar zxf libspatialite-4.4.0-RC0.tar.gz \
+    && cd libspatialite-4.4.0-RC0 && ./configure && make && make install
+
+RUN wget "https://www.gaia-gis.it/gaia-sins/readosm-1.1.0.tar.gz" && tar zxf readosm-1.1.0.tar.gz && cd readosm-1.1.0 && ./configure && make && make install
+
+RUN wget "https://www.gaia-gis.it/gaia-sins/spatialite-tools-4.4.0-RC0.tar.gz" && tar zxf spatialite-tools-4.4.0-RC0.tar.gz \
+    && cd spatialite-tools-4.4.0-RC0 && ./configure && make && make install
+
+
 # Add local code to the image instead of fetching from pypi.
-ADD . /datasette
+COPY . /datasette
 
 RUN pip install /datasette
 
 FROM python:3.6-slim-stretch
 
-# Copy python dependencies
-COPY --from=build /usr/local/lib/python3.6/site-packages /usr/local/lib/python3.6/site-packages
+# Copy python dependencies and spatialite libraries
+COPY --from=build /usr/local/lib/ /usr/local/lib/
 # Copy executables
 COPY --from=build /usr/local/bin /usr/local/bin
 # Copy spatial extensions
 COPY --from=build /usr/lib/x86_64-linux-gnu /usr/lib/x86_64-linux-gnu
 
+ENV LD_LIBRARY_PATH=/usr/local/lib
+
 EXPOSE 8001
 CMD ["datasette"]

datasette/app.py

@@ -256,7 +256,7 @@ class Datasette:
         for fts in ("FTS5", "FTS4", "FTS3"):
             try:
                 conn.execute(
-                    "CREATE VIRTUAL TABLE v{fts} USING {fts} (t TEXT)".format(fts=fts)
+                    "CREATE VIRTUAL TABLE v{fts} USING {fts} (data)".format(fts=fts)
                 )
                 fts_versions.append(fts)
             except sqlite3.OperationalError: