Changed tidy.merMod argument name from `effect = ` to `effects =`. Added `.fixed` column that shows the output without random effects. Fixed the behavior when `na.action = "na.exclude"`, such that `NA`s are included in the augmented output.

Bumped patch number.
Changed tabs to spaces
Merge branch 'pr/7'
Added tests for augment.lm, including handling NAs. Rearranged tests, added helper function file. Added unrowname to tidy.htest.
Changed lme4 testthat test not to give a warning if lme4 is not installed
Added tidy.zoo method (for zoo package). Bumped patch number.
Reorganization of help files to be called _tidiers rather than -tidiers (easier to request with ?, such as ?lm_tidiers). Added examples for many functions that did not have any examples yet. Removed qvalue tidiers since that suggests a package from Bioconductor rather than CRAN (qvalue tidiers are in dgrtwo/biobroom now)