Merge branch 'stable-2.15'

* stable-2.15:
  Documentation: fix spelling
  Upgrade bazlets to latest stable-2.15 to build with 2.15.6 API
  Upgrade bazlets to latest stable-2.14 to build with 2.14.16 API
  Fix classpath generation for Eclipse project
  Align Eclipse compiler settings with core Gerrit's
  WORKSPACE: Make commented out line spaces indent consistent
  Add support for ignoring WIP and Private changes

Change-Id: I2bada5a0e9129517b03005e653dee70eae5cb4c6