Fixed #3: implemented methods gcd and lcm
Implemented methods Unit.in and Unit.as (see issue #5)
Renamed Unit.as to Unit.toNumber (more clear, and more consistent with the rest of the library)
Added a little more explanation on units.
Removed the build-in parser documentation from the core library.
Simplified and improved the scoping of the Parser
Code of the Scope restructured
Fixed an incredibly stupid bug with the constant i
Chained operations via method math.chain... coool!
Renamed Chain to Selector and chain to select
Released version 0.6.0