Add basic docstrings for the AST pretty-printing utilities.  Modify numba.utils.dump() to pass along any additional arguments to numba.utils.pformat_ast().
Add basic docstrings for the AST pretty-printing utilities.  Modify numba.utils.dump() to pass along any additional arguments to numba.utils.pformat_ast().

GaZ3ll3/numba,stefanseefeld/numba,seibert/numba,stonebig/numba,cpcloud/numba,stefanseefeld/numba,gmarkall/numba,pitrou/numba,gmarkall/numba,gmarkall/numba,jriehl/numba,numba/numba,IntelLabs/numba,IntelLabs/numba,seibert/numba,stuartarchibald/numba,pombredanne/numba,cpcloud/numba,stuartarchibald/numba,numba/numba,numba/numba,pitrou/numba,ssarangi/numba,pitrou/numba,shiquanwang/numba,numba/numba,ssarangi/numba,GaZ3ll3/numba,sklam/numba,pombredanne/numba,jriehl/numba,sklam/numba,stonebig/numba,ssarangi/numba,sklam/numba,shiquanwang/numba,pombredanne/numba,cpcloud/numba,stonebig/numba,stuartarchibald/numba,IntelLabs/numba,seibert/numba,GaZ3ll3/numba,stuartarchibald/numba,gdementen/numba,sklam/numba,stefanseefeld/numba,stuartarchibald/numba,stonebig/numba,GaZ3ll3/numba,sklam/numba,stefanseefeld/numba,gmarkall/numba,ssarangi/numba,jriehl/numba,gmarkall/numba,cpcloud/numba,gdementen/numba,pitrou/numba,IntelLabs/numba,pitrou/numba,ssarangi/numba,gdementen/numba,pombredanne/numba,stonebig/numba,gdementen/numba,stefanseefeld/numba,cpcloud/numba,seibert/numba,jriehl/numba,IntelLabs/numba,numba/numba,shiquanwang/numba,seibert/numba,gdementen/numba,jriehl/numba,GaZ3ll3/numba,pombredanne/numba