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
Allow data to be inserted using a dictionary and refactor existing code 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
-Added DefaultExistingRowsTo fluent command when creating columns for existing tables.
-Added a ColumnExpressionBuilderHelper to centralise some of the duplicated functionality in the Column related Expression Builders.
-Added VS2013 solution file
-Refactored Unique Column common logic into shared ColumnExpressionBuilderHelper class, refactored tests.
-Removed any reference to ExistingRowDefault, renamed to SetExistingRowsTo, to address confusion with this being related to db engine defaults.
-Refactored Indexed() call out of individual column expression builders into central location.
Lazy loading migrations
added LazyLoader;
Added Constraint("name").Exists() to SchemaTable syntax
Fixes solution project change
Add tests for constraint schema check
Added MaintenanceAttribute.
Fixed mistakenly committed test options change.
Merge pull request #1 from matthewdunsdon/ConstraintExists

Constraint exists work fixups
Added UnitTest for Index Exists
Added Default SystemMethods.CurrentDateTime for Oracle Backend Generator (maps to oracle keyword CURRENT_TIMESTAMP)

http://docs.oracle.com/cd/B28359_01/server.111/b28286/functions038.htm#SQLRF00629
Added SchemaName to Create, Insert and Delete Table operations for Oracle generator backend
changed oracle tests to correctly check custom schema in Create, Insert, Delete