Initial work on Static Taylor Series

[mewilhel]

Follow-up from JuliaDiff/TaylorSeries.jl#241

• Introduces a STaylor1{N,T} type.
• Contains same arithmetic operations as the Taylor1 type except tan, tanh, asin, acos, atan which are tests verses the results from the analogous Taylor1 object. I plan on adding the missing operators in the future.
• A number of the operators required generated functions to avoid mutable intermediate storage, so these get a little complex and there may be some room for improving performance.