Remove vars from the babushka DSL. (deprecated on 2012-06-12).
Don't load or save vars anymore.
Clean up ~/.babushka/vars when babushka is run (to revert after around 2012-08).
Remove the logic from Babushka::Vars, converting it to a module for the #removed! calls.
There's no such thing as a dynamic value when prompting anymore.
Remove vars from bug reports.
Remove the var load and save logic from Babushka::Task.
Rename vars to args as appropriate.
Prompt has never responded to :var -- this is a refactoring relic.
Reword some --help descriptions.
No need to include source_support in task_spec.
Remove Hash#reject_r[!].
Add some parens in Babushka::Task.
Explicitly depend pip on python.bin

Otherwise, trying to install pip binaries explodes with a confusing
python-config error, as pip doesn't directly depend on python-dev on
ubuntu.
Merge pull request #252 from richo/features/pip_python

Explicitly depend pip on python.bin
Pull in python from 'pip.bin', not from the top-level 'pip' dep, which just switches based on system.
Bundle update.
v0.15.8 - Improved python/pip handling, 'src' template and 'build tools' updates.

* Improved python/pip sudo handling -- thanks to @tamird
* Updated python/pip deps to install headers on all platforms
* More consistent 'build tools' behaviour with simplified deps
* Avoid unncessecary 'build tools' installs from 'src' deps
Merge branch 'remove-vars'. Onwards and upwards!
Merge branch 'cleanup' -- some things I found while removing vars.