Obliterating linspace for integer types from swig.

Linspace with integer types is dangerous:
$ linspace(0,1,100)
You'd get 99 zeros and 1 one without this fix.
You'd have to remember to do:
$ linspace(0,1.0,100)
Completed IRKIntegrator (forward integration only), #948
Added note, #948
Implemented IRKIntegrator backward integration (not ready for use), #948
Corrected taping in RKBase, #948
Got IRKIntegrator backward integration working (still inconsistent with CollocationIntegrator), #948
Added IRKIntegrator to sensitivity_analysis.cpp example, #948
automatic documentation update
automatic casadibot merge