[EMR] Correct MapR AMI version in create-cluster examples

MapR doesn't support Hadoop 2.
[EMR] Remove create-cluster --applications default value and update EMRFS bootstrap action name

This fix removes installing Hive and Pig by default in create-cluster command.
[EMR] Update the EMRFS bootstrap action name to be 'Setup EMRFS'
[EMR] Update create-cluster synopsis
Bumping version to 1.5.5
Merge branch 'release-1.5.5' into develop

* release-1.5.5:
  Bumping version to 1.5.5
  [EMR] Update create-cluster synopsis
  [EMR] Update the EMRFS bootstrap action name to be 'Setup EMRFS'
  [EMR] Remove create-cluster --applications default value and update EMRFS bootstrap action name
  [EMR] Correct MapR AMI version in create-cluster examples