added .obj files to be ignored by git version control
added minor feature: return the number of the output function when adding a new one
split of the integrator type options in standard ACADO and code generation types, according to issue #27
repaired a code generation example
added info to error message, related to index out of range, to strongly simplify debugging
added support for externally defined linear in- and output systems in the model
Merge branch 'master' of github.com:acado/acado