#20 support different storage engine per table
#146 Enhancements to the GORM-manager

- support different storage engines per table (see also #60)
- support update of indices (see also #20)
- improve column type comparison to avoid unnecessary update statements
- use information_schema for analysing database columns to improve speed
of the gorm-manager
add missing clean up updateStatements
Merge pull request #3 from dingsda87/feature-id-146-gorm-manager

Merge feature development for ID#20, ID#60, ID#146 for GORM.