v0.2.1: Merge pull request #15 from nir0s/various-fixes-and-optimizations

• Added missing docstrings
• Basing LSB info on lsb_release -a instead of /etc/lsb-release. Apparently, the file is not a part of the standard.. but the command is.
• ld.info() no longer contains name and codename fields as they're not machine readable by default.
• ld.name() and ld.version() implementations are now more consistent between types of lookup mechanisms. Overall consistency improved.
• Testing coverage is now 96%
• Python3 fixes applied.