Fixes for the make pycharm script:

1. Escape $'s
2. Use root directory name as project name
3. Exclude some noisy directories

Testing Done:
$ cat .idea/incubator-aurora.iml

Reviewed at https://reviews.apache.org/r/27892/
Add documentation for the beta-update command.

Bugs closed: AURORA-763

Reviewed at https://reviews.apache.org/r/27089/
Fix coverage epsilon.

BUILD SUCCESSFUL

Reviewed at https://reviews.apache.org/r/27935/
Remove non-fixed tickets from CHANGELOG.

Bugs closed: AURORA-711

Reviewed at https://reviews.apache.org/r/27934/
Fix review bot to use correct latest diff time.

Reviewed at https://reviews.apache.org/r/27941/
Store host attributes alongside offers to reduce number of lookups.

Bugs closed: AURORA-913

Reviewed at https://reviews.apache.org/r/27902/
Don't fail the build when exceeding coverage thresholds.

Reviewed at https://reviews.apache.org/r/27949/
Fix bad review text in review bot.

Reviewed at https://reviews.apache.org/r/27954/
Upgrade to gradle 2.2

Reviewed at https://reviews.apache.org/r/27996/
Setting the max thread limit on AsyncEventBus.

Bugs closed: AURORA-926

Reviewed at https://reviews.apache.org/r/27947/
Reset CHANGELOG and .auroraversion in prep for 0.6.0-RC2.

Reviewed at https://reviews.apache.org/r/28005/
Add friendly error message to the client when lock is held.

Bugs closed: AURORA-885

Reviewed at https://reviews.apache.org/r/27848/
Updating CHANGELOG for 0.6.0 release.
Incrementing snapshot version to 0.6.1-SNAPSHOT.
Splitting cron and non-cron job creation in client v2.

Bugs closed: AURORA-917

Reviewed at https://reviews.apache.org/r/27747/
Adding resource consumption calculation for cron jobs.

Bugs closed: AURORA-825

Reviewed at https://reviews.apache.org/r/27601/