Fix #13 and a few other bugs.
Add the new "filesize" property to the converter.
Small fixes for the converter's download module.
Further fixes for converter.download.
More fixes..
Improve the progress bars in HTML pages and the (un)installation of packages.
We now display the download size in the new package list.
Merge branch 'develop'
Release 0.1.0.dev3
* Improved the build system
* Refactored repo storage (mods are now stored in ~/.knossos/mods.json)
* Fix issues on Linux where FSO depends on missing libraries
* Added the "executable" property to packages
* Added a new condition type to packages: "bool"
* Added code to make the converter download files from box.com
* Added (experimental) version pinning for mods.
* Fixed a few minor bugs.