Fixed bug for gcc 4.7.

CKilo: deleted warning.
sqlite3_wrapper: I'm not sure but make_pair can cause type problem
with implicit cast of column_value.
test_cdatabase: split text for user defined literal.
Make query function to const.
Merge pull request #25 from liquidamber/gcc4.7

Fixed C++11 code compatible with gcc 4.7.

casting, initializer-list, BOOST_STRINGIZE is not user-defined literal.
Fixed README indent.
Merge branch 'master' into wxares

Conflicts:
	README.md