Build with libsqlite3 on Ubuntu 14.04 LTS

[shaxbee]

• Sets default value of SQLITE_DETERMINISTIC to 0 if undefined.
• Skip FTS4 test if unicode61 tokenizer is unavailable
• Test go-sqlite3 against libsqlite3
• Test go-sqlite3 against golang versions 1.5 / 1.6

[coveralls]

Coverage remained the same at 66.739% when pulling 25d2b1e on shaxbee:master into 467f50b on mattn:master.

[coveralls]

Coverage remained the same at 66.739% when pulling 42d4117 on shaxbee:master into 467f50b on mattn:master.

[mattn]

Seems totaly okay to me. Thanks.
BTW, why you remove goveralls repository token? 42d4117

[shaxbee]

I brought it back, didn't want to pollute your goveralls stats with my private builds, personally I use COVERALLS_TOKEN :-)

[shaxbee]

Could this be merged? It's blocking me on spatialite integration :-)

[shaxbee]

@mattn Could this be merged?

[mattn]

Thank you