Converting fmdb.m to XCTest tests.

Move FMDBTempDBTests class into the Tests directory.
Add a .travis.yml file to use Travis CI for automated testing.

Add a Tests scheme for Travis CI.
Add a build status image from Travis-CI.

This will only work if @ccgus adds fmdb to Travis-CI.
Fix -[FMDatabaseTests testApplicationID]

There were compile errors in this code because I just copy/pasted it from fmdb.m without making the changes for XCTest.  It wasn't causing problems for me because I am using a version of SQLite older than the preprocessor check.
Merge branch 'testcases' of git://github.com/GrahamDennis/fmdb into GrahamDennis-testcases