Add --auto to the reintegrate documentation.
Stubbing out the changes, until I realised it's a bit pointless to automatically list everything from a dev branch when reintegrating.
Add support for --auto commit message when reintegrating a branch.

* Grab the eligible revisions after the switch, but before the merge.
* Build the commit message from the eligible revisions when passed --auto.
Merge branch 'auto-reintegrate' into 'develop'.

Add support for --auto on the reintegrate command. This feature automatically
builds the commit message, using the eligible revisions' commit messages from
the branch you are reintegrating.

Closes #4.
Add checks for Subversion 1.8, and disable --reintegrate for it.
Update messages to reflect the --reintegrate deprecation.