copy dicttoolz to objtoolz
implement objtoolz (converting from dicttoolz)
copy test_objtoolz from test_dicttoolz
add objtoolz to init
rename parameter
implement objtoolz tests (converting from dicttoolz tests)
fix doctest to match printed output of dict
rename param
fix error type
keys come before obj in get_in
pass lambdas to 'raises'
fix comment