Update install.sh

sed --version and date --version do not work on OSX. Instead i used [this method](http://stackoverflow.com/questions/592620/how-to-check-if-a-program-exists-from-a-bash-script/677212#677212) to determine if these tools were installed.
fixed syntax error
tput colors instead
Update README.md

Clean up broken markdown in readme
Merge pull request #3 from mikedfunk/tput-colors

Tput colors
Merge pull request #4 from mikedfunk/patch-1

Update README.md
Merge branch 'develop'
Merge branch 'release/0.5.0'
Merge branch 'release/0.5.1'
Merge branch 'release/0.5.2'
Merge branch 'release/0.5.3'
Merge branch 'release/0.5.4'
Merge branch 'release/0.5.5'
Merge branch 'release/0.5.6'

Conflicts:
	install.sh
Merge branch 'release/0.5.7'
Merge branch 'master' into develop
Make important loglines cyan.
Bump to 0.5.8.
Merge branch 'release/0.5.8' into develop