Add Module Update Command functionality

Add dev:module:update command with the following options:
set-version
add-blocks
add-helpers
add-models
add-all
add-resource-model
add-routers
add-events
add-layout-updates
add-translate
add-default
Merge pull request #1 from netz98/develop

Develop
Merge branch 'feature/module-update' into develop

Conflicts:
	n98-magerun.phar
Merge branch 'develop' into feature/module-update
Determine code pool from module directory
Add phpunit test file for Update command
Merge branch 'feature/module-update' into develop
Merge branch 'develop' of https://github.com/netz98/n98-magerun into develop
Regenarate phar
Remove exception
Merge branch 'feature/module-update' into develop
Regenerate phar
Phpunit tests for --set-version and --add-routers command
Regenerate phar
Fix undefined variable $filesystem
Implement tests for each command option
enable or disable a module based on name or codepool
Refactored db:maintain:check-tables to allow InnoDB and Memory tables to be optimized.
Initial add of Variables Command
Minor documentation corrections