Revert "Temporarily disable TravisCI caches of M2_REPO"
Revert "Temporarily disable TravisCI caches of M2_REPO"

This reverts commit a54277aa6ba775baf53fe07b602bb486f82bcc3d.

mosoft521/wicket,mosoft521/wicket,apache/wicket,apache/wicket,apache/wicket,apache/wicket,apache/wicket,mosoft521/wicket,mosoft521/wicket,mosoft521/wicket