acu148161 Retry the request on certain exceptions

These requests happen in heavy packetloss situations
acu148161 Add additional error handling for get requests
acu148161 Rakefile updated to rspec2 syntax
acu148161 Bump version and changelog
acu148161 Add pull request id
acu151452 - Remove patch and add more options

- Remove the Net::HTTP monkey patch as it will be included in
  rightscale_tools instead.
- Add configurable max_attempts and enable_retry options. The
  enable_retry option will default to false as to not break previous
  behavior.
acu151452 - Make retry logic consistent.
acu151452 - Make default timeouts the same as their previous behavior.
Merge pull request #50 from rightscale/ivory_14_02_acu148161_harden_for_shanghai

Ivory 14 02 acu148161 harden vs packetloss