* Uses `perl` as a last resort if `curl` and `wget` are not available (fixes#537)
* Aborts and notifies user if none of the above are installed
* Better use of functions
* When version numbers are checked, the contents are immediately saved to a temp dir. This allows us to skip using wget/curl/perl a second time
* Improved messages for users
* Added various font colors for ease of use and aesthetics
