Added pow(quantity,ratio) function
Conflig resolution after merging from remote.
Corrected spelling in README.md.
Basics of unit systems and conversion implemented. Can't handle non-scalar types nicely yet and still a bit messy.
Added push_front and push_back metafunctions for static lists
Added user defined literals but they are not yet functional.
Added UDLs for dimensional quantities as well as a some convenience template aliases.
Update to README.md