Update rebar
tmp
remove "-mode embedded" from command args

devrel replaces lib/snowflake-<Version>/ebin by symlink by name snowflake
(without -<Version>).
In embedded mode, the directory without <-Version> is not included in
load paths.
remove otp version requirement
Merge branch 'feature/tmp' into develop
Add ignore plt file
Add ignore dir .test/*
Add "make watch" command
Update rebar
Ccomment out unnecessary settings
Merge branch 'develop' into feature/cowboy

Conflicts:
	rebar.config