Add missing @param tags

Don't return the return values of methods that do not return anything

Fix incorrect reference to PDO in DB2Statement

Fix incorrect type hint in TableDiff

Remove plain wrong type hint where none is needed to begin with

Get rid of weird ternary statement

Various doc imporvements in Index

Documentation and style improvements to Table

Add composer.lock and .idea/ to .gitignore

Simplify FQNs in Column

Improve type docs in ColumnDiff

Add missing @param tag

Fixed the installation of HHVM nightly on Travis

Added new test WriteTest::testEmptyIdentityInsert().

Performance improvement on BlobType

Lower case "order by" keyword causes wrong LIMIT query on SQL Server

Fixed type and initialization value of $_nestTransactionsWithSavepoints

Removed unused imports and unnecessary FQCN

Fixed Configuration::getSQLLogger() return type

fix lastInsertId typehint in SqlSrv