Various rsync deployment fixups:

1) If ssh_key was absent, you'd get an error.
2) Had to specify full path to key ("/Users/jfrisby/.ssh/...") -- couldn't use "~/.ssh/...".  Since SSH demands it be there anyway, let's pre-populate for the user and make their lives easier.
3) Ensure uniform and consistent trailing slashes on source and dest paths to avoid accidentally mucking things up.
Eliminating ternary op.
Added javascript asset management and improved Rakefiles and configuration for themes and plugins.
- Added Guard for file watching
- Configs can be automatically reloaded
- Static asset changes do not trigger Jekyll build
- CommonJS modular js support proved by stich-rb
- Javascript is concatenated and uglified
- Environment variables toggle uglify and fingerprinting
- New Jekyll plugin config_tag
- New Jekyll plugin javascript_assets_tag
- Added theme specific configurations
- Custome Jekyll Guard to the rescue
- Install, Generate, Watch, and Preview work with Guard now.
- Now configs are no longer tracked by Octopress, only theme defauts are.
- Console messages can be colorized.
- misc config reorganization and improvements
Merge pull request #1019 from imathis/guard

Guard watching + Javascript asset management
Merge pull request #1081 from MrJoy/rsync_deployment_fixups

Various rsync deployment fixups:
Merge branch '2.1' of git://github.com/imathis/octopress into testing-2.1

Conflicts:
	Gemfile
	Gemfile.lock
	_config/deploy.yml
	_config/site.yml