Created Entity annotation
Deleted redundant annotation
Table annotation has a field which isn't required now
value field isn't required anymore
Done some refactoring
Now method checks for presence annotation
Added some new text
Fixed several syntax errors
Changed methods signatures
Method checks now for annotation's value presence
Added columns definition section
Moved query creation process to QueryCreator class as well as added two another subtypes for each of the databases
Removed dead code as well as fixed several type errors
Fixed several type errors
Fixed several type errors
Wrote new sections about API as well as fixed some errors
Merge branch 'develop'