fix #2453 (os x build error)
doc: Remove "en/latest/" from docs link

Consistent with JuliaLang/julialang.github.com@c578a2b
doc: Use DejaVu Serif as alt font on Linux

Consistent with JuliaLang/julialang.github.com@003f236
remove some more redundant BitArray defs
add an argument to parse() to tell it whether to throw errors
Move units.jl into a package
update doc for require, reload, include, include_string, and evalfile
closes #2391
Merge branch 'master' of github.com:JuliaLang/julia