update skill_tree view so that skill requirements are easily sortable
indentation classes (first person to look at this is going to tell me how stupid i am for doing it this way)
shared template for displaying the skill requirements table (fairly similar to the in-game table)
display the pre-requisites for the current skill on its detail page
collect skill rank and description for all required skills
move required level to end of skill name and convert to roman numeral, put skill rank in the level's former place
display a 'no prereqs' row in the required skills table if there are none
get skill ranks from SDE
fix skill rank import for a handful of testing-only skills that were floats, not integers like we require
character attribute import from SDE
not that it really matters, but fix indentation on output of attribute import script