Merge pull request #56 from goretkin/master

`minimum` and etc. now work on PiecewiseSpace Funs
Fixed #57: Clenshaw now implemented for range
improved domainplot
Merge pull request #58 from goretkin/master

add TravisCI and Coveralls
Fixed #51: Fun(f->Float64[0.0],50)
sample for piecewise
vec(f,k) to get just one index
fixed colleague_eigvals
domainplot work
rootsunit_coeffs typing
Unify roots
removed float64()
Changed CurveSpace to a MappedSpace
identity_fun(::CurveSpace)
Changed \ and ^ to use divide_singularity
fixed divide_singularity for 1-x^2
fixed for 1-x and 1+x
Work on Curve
relaxed in(y,Interval)
Small refinements for hilbert
Hilbert for square root singularities
Added canonicalspace
Fixed constant for H