Fixed doc comments in Migration classes
Renamed Importer class names to SchemaImporter
Fixed some class doc blocks
Fixed doc blocks
Merge remote-tracking branch 'origin/master'
Fixed decimal column type mapping
Added MysqlPlatformTest
Changed MysqlPlatform::getColumnDefinitionSql() - fixed column definitions for types decimal and time
Removed MysqlPlatformTest
Changed PlatformTest
  added tests
Merge remote-tracking branch 'origin/master'