Merge branch 'stable-2.15'

* stable-2.15:
  Add dependency on commons-lang3
  Update bazlets to latest revision on stable-2.15
  Update bazlets to latest revision on stable-2.14
  Name eclipse project "gitiles-plugin"
  Update bazlets to latest revision on stable-2.14
  Update bazlets to latest stable-2.15

Change I7120977be ("Add dependency on commons-lang3") is reverted by
this merge since that library is still used and exported in the plugin
API on gerrit master.

This reverts commit b86ab7db656435ad26ca2bfeddcace7f3c20d109.

Change-Id: I852515e67ad7a3e714b758480129de26c9283450