Improve performance of a decorated DiffCollection instance

See merge request !108

Add forwardable require to Repository

This class makes use of the Forwardable stdlib but didn't require it
explicitly.

See merge request !107

This class makes use of the Forwardable stdlib but didn't require it
explicitly.

Test against Ruby 2.3 and use caching of gems

See merge request !106

Expose tags git object sha (if it's an annotated tag)

Closes #24

See merge request !104

Refactor Refs to preserve their target objects instead of just a string representation

Notice that in `spec/tag_spec.rb` I changed the sha because previously they
referenced the tag annotation commit. With the refactor, the sha must be the one
of the commit that the tag actually points at.

Closes #22

See merge request !103

Notice that in `spec/tag_spec.rb` I changed the sha because previously they
referenced the tag annotation commit. With the refactor, the sha must be the one
of the commit that the tag actually points at.

Handle collapsable DiffCollection

We want to give the user the opportunity to see more files while preserving safe limits on rendering diffs so files bigger than 10KB (we consider too large 100KB) their lines are not taking into account to decide if the collection overflow and you can decide if you want to expand them on click or no. And those files will be collapsed by default (they are just quite big).

Besides to keep good performance we start collapsing all the files since we are over the safe limits (what we used before as hard limits). So we can start measuring rendering files with expand links and in the future move to higher the safe limits maybe.

To do that you have to methods `collapsed?` and `collapse` which means if it's quite large and the other if the collection collapsed it when iterated as a whole.

It's quite similar to the `too_large`concept but give us a little bit more flexibility.

Related with: https://gitlab.com/gitlab-org/gitlab-ce/issues/19820

See merge request !101

We want to give the user the opportunity to see more
files while preserving safe limits on rendering diffs
so files bigger than 10KB (we consider too large 100KB)
their lines are not taking into account to decide
if the collection overflow and you can decide if
you want to expand them on click or no.

To keep good performance we start collapsing all
the files since we are over the safe limits.

To do that you have to methods `collapsed?` and
`collapse` which means if it's quite large and the
other if the collection collapsed it when iterated
as a whole.

It's quite similar to the `too_large`concept but
give us a little bit more flexibility.

Optional ref update on commit create



See merge request !102

Adds rename action to blob.rb

This is a needed refactor because of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5049

It will allow to change the name of a file and update it's content in one single commit by deleting the old file and making a new copy
with the new name and new changes.

See merge request !95

Merge branch 'commit-blob-rename-action' of gitlab.com:gitlab-org/gitlab_git into commit-blob-rename-action