Merge tag '0.6' into develop

Added tests and made CMakeLists more robust/flexible (I hope)
Adjusted to sqlpp11's new interpreter and result logic
Added code for prepared statements (untested).
Renamed query -> statement
Specialized interpreter to prevent unsupported joins
Prepared insert, update and remove seem to work now
Dynamic statements work again
Prepared select compiles

More tests needed
Fixed DynamicSelectTest
Fixed missing return
Use bind_result instead of char_result
Removed obsolete char_result
Removed obsolete const cast
Merge branch 'release/0.7'