Updated the default mapping of Int64 to NUMBER(19,0) to match the default type mapping used by Oracle.

See Table 3-4: Mapping of Oracle Data Types and EDM Types (http://docs.oracle.com/cd/E11882_01/win.112/e18754/featLINQ.htm)
Issue #388 : Added rake support for building the FluentMigrator.Runners package when the nuget:package task is invoked
Added description support for migrations

Signed-off-by: Michał Zalewski <michal@mzalewski.net>
Merged with upstream/master
Added IVersionMetaDataEx(tended) closes  #295
Choose the least breaking way of implementing this feature
Renamed IVersionTableMetaDataEx to IVersionTableMetaDataExtended, just to reveal intend better
Partially reverted ForwardOnlyMigration closes #436
Merge branch 'master' of https://github.com/drucik86/fluentmigrator into drucik86-master
Fix issue with versionloader and fix tests
Merge pull request #401 of drucik86/master

# By Michał Zalewski (1) and Tom Marien (1)
# Via Tom Marien (2) and Michał Zalewski (1)
* drucik86-master:
  Fix issue with versionloader and fix tests
  Added description support for migrations
VersionLoader gets version column by name closes #456
Merge branch 'Issue295' of https://github.com/tommarien/fluentmigrator into tommarien-Issue295

Conflicts:
	src/FluentMigrator.Runner/VersionLoader.cs
	src/FluentMigrator.Tests/Unit/TestVersionTableMetaData.cs
	src/FluentMigrator/VersionTableInfo/DefaultVersionTableMetaData.cs
Merge pull Request #427 of tommarien/Issue295

* tommarien-Issue295:
  Renamed IVersionTableMetaDataEx to IVersionTableMetaDataExtended, just to reveal intend better
  Added IVersionMetaDataEx(tended) closes  #295 Choose the least breaking way of implementing this feature
Bumped version to prepare for release
Allow data to be inserted using a dictionary and refactor existing code closes #458
Fallback to Migration Type name if Description is not supplied closes #458
Update MySqlTypeMap.cs

version 1.1.2 causes error when migrating 'versioninfo' table by adding a 'description' column on MySQL database.
This error caused by method 'Up' in 'VersionDescriptionMigration' class. The method calls .AsString(int.MaxValue) which is beyond 
definition in MySqlTypeMap class
Fixed description column to string(1024) as int.MaxValue was not supported yet for every processor
Merge branch 'FB-457' of https://github.com/tommarien/fluentmigrator into tommarien-FB-457
Merge pull request #460 of tommarien/FB-457

* tommarien-FB-457:
  Fallback to Migration Type name if Description is not supplied closes #458