Merge tag '1.3.0' into develop

Version 1.3.0
Preparation for new development cycle after release 1.3.0
Merge tag '1.3.1' into develop

Version 1.3.1
Forgot to save my changes :/
Add extra functionality

You can now install either the stable release or the development release
with the 3rd party script gitflow-installer.sh
Permit to use a single symlink as installation method

This patch permit to create a link in $PATH pointing to sources.

* git-flow (GITFLOW_DIR): dereference $0 to handle symlink.
Update the changelog
Version bump 1.4.0-dev.7
Fixes some small errors in the text
Small typo changed
Add needed functions and global variable.

The functions for getting/setting/removing the base branch from the config file are added.

The global variable GITFLOW_CONFIG holds the location and name of the new config file. This config file can be used in the future for other options.
Adapted for remembering the base
Update with info about remember base.
Check that the base is a local branch.
Remove base section

When finishing a hotfix/feature/release and we're not keeping the branch we worked on we need to remove the base section from the configuration file.
Suppress error messages on removing from config
Version bump 1.4.0-dev.16
Merge branch 'feature/remember-base' into develop
Forgot then in if statement
Reverse pull request

As OSX, FreeBSD can't handle readlink -e we're reverse a previous
commit ( Permit to use a single symlink as installation method)