'**' denotes big changes
'*' denotes minor changes

1.1

** Large rewrite of internal code organization. You can now specify arbitrary
   fitting functions, criteria, and elimination functions.
* Add 'include' argument to force terms to always be in the formula (fixes
  github bug #1)
* New function 'buildcustom'
* Added raw log-likelihood as a criterion: 'LL'
* Fix bug in calculating anova table with lmerTest ddf options
* Make calcWald respect numerator df in anova table
* Remove incorrect gradient check for mgcv models in conv(), instead check for
  'full convergence' string
