[grunt] use grunt_esvm to start es
Fix handling of multiple unescaped sequences in index pattern matching. Closes #1570
[esvm] put esvm behind a flag
Update CONTRIBUTING.md
[es] use the pre-release client
[grunt dev] use --with-es to start es
Merge pull request #1754 from rashidkpc/fix/index-to-wildcard

Fix handling of unescaped sequences in index patterns, closes #1570
[grunt esvm] bind elasticsearch to localhost
[css/textarea] default resize is vertical only
Merge pull request #1738 from spenceralger/grunt_esvm

Use grunt-esvm to start es