Bump version for release 2.0.6
Add .pre for next release
Skip precompiling assets when git diff shows no changes to app/assets

Support new ey.yml option `precompile_assets_task` to override the rake
task that runs to compile assets.
Improve error messaging
Test CLI parser using engineyard-serverside-adapter
Refactor bundler/npm dependency management.

This refactoring has the potential to break eydeploy.rb files.
Don't use pg in fixture Gemfiles because it slows everything down
ey.yml option `precompile_unchanged_assets: true`

Precompiles assets even if no changes would be detected
ey.yml option `bundle_options:` to specify extra bundle install options

If both `bundle_without` and `bundle_options` are specified, both will
be used as follows:

    // ey.yml
    bundle_without: test
    bundle_options: --local

    "bundle install ... --without test --local"

If `bundle_without` is nil, --without will not be sent:

    // ey.yml
    bundle_without:
    bundle_options: --local

    "bundle install ... --local"
Refactor asset compilation to clean up status messages
Fix a race condition where 'current' symlink wasn't changed atomically

Using mv -T to move the 'current' symlink makes the switch atomic
at the kernel level, so things can't sneak in between rm && ln
Remove an extra arbtrarily placed chown
Normalize chowning everywhere. Always use find.

In my brief testing, find chown is faster than chown -R and
less likely to break things.
Fix error naming inconsistency in hook errors
Upgrade default bundler version to 1.3.4
Use RailsAssets class to compile assets

This removes cruft from the deploy class and encapsulates
asset build related functions. This also allowed for improvements
to the flexibility of asset compilation.
Use pathname it git repo
http => https in Gemfiles (ugh)

Bundling should be abstracted from the tests for lots of reasons
Separate Bundler from BundlerLock

Both these bundler behaviors are different enough that
separating them simplifies both classes.