Added union(space,space)
First go at adding piecewise
Fixed Jacobi conversion_rule
Fixed in for interval and evaluate for pw fun at vector
Restarted domainplot using Compose
Merge pull request #53 from MikaelSlevinsky/master

BigFloat Cooley-Tukey FFT and Interval invariance
`minimum` and etc. now work on PiecewiseSpace Funs
Solving an ODE with Picard iterations
Merge pull request #56 from goretkin/master

`minimum` and etc. now work on PiecewiseSpace Funs