Add colors and a progress bar to the CLI application

Recently a new feature has been added to the framework that allows CLI applications to display colorful output on ANSI enabled terminals. So I thought we might see how it looks and feels ;)

## Colors
ANSI color codes are supported in most (if not all) *nix style terminals.
To test this feature I grabbed a VM with Windows XP, installed git for Windows and GitHub (both include terminals) but neither them nor the standard Windows thingy supported ANSI colors.
Then I installed [Cygwin](http://www.cygwin.com/) (which is a good choice anyway), and got the following output:
![win-colors1](https://f.cloud.github.com/assets/33978/491726/2c5ff9b4-ba54-11e2-80eb-76a29914d58a.png)

## Progress Bar
Since we have some long runng operations (currently ~10 min pulling the CMS issues on my slow i-net), I thought we might use some "high class" progress bar.

The progress bar is not part of the repo and has to be installed using composer from [elkuku/console-progressbar](https://packagist.org/packages/elkuku/console-progressbar) (which is a fork of [PEAR/Console_ProgressBar](http://pear.php.net/package/Console_ProgressBar) with a facelifting ;)
I haven't tried that on windows, but it might work on cygwin...
![progressbar3](https://f.cloud.github.com/assets/33978/491733/a36ce152-ba54-11e2-8c06-179b6a379876.png)

## Unsupported...
If your terminal does not support ANSI control codes you may see something like this:
![win-colors-fail](https://f.cloud.github.com/assets/33978/491728/57cc233e-ba54-11e2-9c6b-154ad99488fd.png)

## Turn it off !
To suppress color ouput for a single command use the `--nocolors` switch.
Example:
`tracker.php retrieve issues --nocolors`

To turn the features off permanently edit `etc/config.json` and set the values for the undesired features from `1` to `0`.

----
Since most of the code in this PR has been used to actually test this feature before submitting it to the framework, I thought I could give this here back too.

If you have any strong feelings against this, please raise your voice here and now or I am going to merge it ;)