Make raise work when called as "raise Error('string')".

Previously only "raise Error, 'string'" and "raise Error" worked successfully, as well as re-raising.
Update SystemError so you don't need to use new.
Update dist.
Add .gitattributes to force LF.
Merge pull request #117 from albertjan/force-lf

Add .gitattributes to force LF.
Make Sk.currLineNo the secondary source of line information, preferring line number information from the parameter to the constructor.
Merge branch 'master' of github.com:bnmnetp/skulpt

Conflicts:
	dist/skulpt.js
rebuild dist