Merge pull request #3666 from amitmurthy/amitm/doc

doc update
minor cleanup in addprocs
docs: Fixed newlines in stdlib.parallel section
Merge pull request #3669 from amitmurthy/amitm/mfixup

minor cleanup in addprocs
ignore BOM in source files. fixes #3675
Initial changes to split delete!(h::Dict,key) into pop!(), delete!()
Finished splitting delete!() into pop!() and delete!()
Add documentation for pop!(collection, key[, default])
Minor updates.
Deprecate Set add! in favor of push!, for symmetry with pop!

* Also: add push!(h::Dict, k, v) for symmetry with pop!(h::Dict)
Removed jl_eqtable_del