Implemented support for generating table descriptions and column descriptions for Oracle and SqlServer (version 2005 or greater), added unit tests for the newly implemented feature. Also, refactored code by moving FormatSqlEscape method (which was duplicated in multiple classes) in static class FormatHelper.
Removed InvalidOperationException and added license region to ForwardOnlyMigration closes #436
Merge pull request #438 from tommarien/forwardonly-migration-does-not-throw

ForwardOnlyMigration does not throw anymore on down
Added Gemfile to better manage gem dependencies.
Merge pull request #444 from kieranmaine/master

Added Gemfile to better manage gem dependencies.
Specify tab size for Ruby code
Merge pull request #428 from stefan-ojog/master

Added description support for tables and columns on MS Sql Server and Oracle
Environment.Newline fix for sql server 2005 generator tests