Update README.
Merge pull request #6 from tomstockton/update_readme

Update README.
Cleaned up output and added git clone error handling
Output changes following feedback
Remove progress_bar from git clone
Merge pull request #7 from seanclerkin/master

Clean up output and add git clone error handling
Add new line after echo
Merge pull request #8 from seanclerkin/master

Add new line after echo
change CentOS version
Reduced number of puppet apply calls per set_facter call; this leads to ~60s reduction in typical tru-strap boot time
Merge pull request #10 from cornelf/bump_centos

change CentOS version
tru-strap included RVM
removed \
commented out RVM adjustments
uncommented RVM
inserted RVM for Ruby
Merge pull request #12 from allan-gill/master

Inserted RVM for latest Ruby
changed progress bar around RVM curl
Merge pull request #13 from allan-gill/master

changed progress bar around RVM curl command
Use system ruby version (1.8.7) by default