Bumping version to 2.1.5

Bumping version to "2.1.4"

Bumping version to "2.1.4 pl1"

Bumping version to '2.1.4 rc1'.

Bumping version to "2.1.3" final

Bumping version to "2.1.3 pl1"

Merge branch 'release/2.1' of github.com:bolt/bolt into release/2.1

Tagging v2.1.2

Bumping version to "2.1.1-pl1" Herp Derp, forgot to set the "stable" …

…flag.

Bumping version to "2.1.1" (final)