R-distributions and vectorization macros
Author: Théo <theo.michelot@insa-rouen.fr>
    - Added distributions: binom, exp, weibull in distributions_R.hpp
    - Added macros to vectorize new R distributions.
Merge remote-tracking branch 'origin/hans'
Typos in Doxygen
New folder tmb_syntax
Move relevant files to new folder
Add tmb_syntax to Doxygen example path
Squashed commit of the following:
    - New folder tmb_syntax
    - Move relevant examples to new folder
    - Add tmb_syntax to Doxygen example path
Merge branch 'master' into kasper
Script to check correctness of distributions
Documentation: TMB_componets figure