Merge branch 'release/0.2.11' into devel

* release/0.2.11:
  Update Gemfile.lock accordingly
  bump to version '0.2.11'
remove ruby-head from travis build

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
pre-install git-flow

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
correct spec for git-flow

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
disable code climate on travis since tests on travis report less coverage than local

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
add list_item

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
simplify displayed tasks upon 'rake -T'

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
correction

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
bump to version '0.2.12'

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
Update Gemfile.lock accordingly

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
Merge branch 'release/0.2.12' into production

* release/0.2.12:
  Update Gemfile.lock accordingly
  bump to version '0.2.12'
  correction
  simplify displayed tasks upon 'rake -T'
  add list_item
  disable code climate on travis since tests on travis report less coverage than local
  correct spec for git-flow
  pre-install git-flow
  remove ruby-head from travis build