Added functions:
- modlist - displays currently installed modules.
- drinst - installs and enables the specified module
- dtricks - displays helptext
added -y to dren and drdis to avoid manually typing y's
Renamed tricks into dalias. Added copyright information.
Updated copyright information.
Upadted README
Minor fix: --help
Merge branch 'hrmoller'

Conflicts:
	README.md
	drush-alias.sh
Aligned text printed in dalias()
Merge branch 'hrmoller'
Merge pull request #6 from hrmoller/master

Added three new functions