add - invert first pass
use - some hints from lodash
add - description
add - invert which handles collisions
describe - invert for objects with duplicate values
Merge branch 'feature/invert' into develop
fix - non-existent _curry1 function
clean - invert
clean - invertMany
clean - code style
fix - example test
rename - invert and invert.many
init - invert tests
test - type input and output
test - unassuming test for values of the object
test - output of simple result
test - keys being put into the appropriate array
add - sanity test
port - invert tests to invertObj
test - simple result for invertObj