Added newdata argument for augment.nls. Added documentation and examples for newdata argument to augment.lm, as well as .resid column.

Fixed up some formatting.

Added Boris to DESCRIPTION as contributor.
Merge branch 'pr/8'
Changed augment.lm to include .fitted.response and .se.fit.response for glm objects.

Added further tests for lm and glm objects.
Merge branch 'pr/8'
Fixed README message of `install_github` to accomodate deprecation of "username" argument.

Added Lahman package (used in tests) to "Suggests".
Added documentation of .fitted.response and .se.fit.response columns to augment.lm.
Added dedicated tidy and glance methods for data frames, which adds a dependency on the psych package.

Moved all data.frame tidiers out of their respective tidy.R/augment.R/glance.R and into data.frame_tidiers.R, which also includes documentation.
Added glmnet and survival tidiers.

Added dplyr bootstrap function since it is often used in examples, along with the vignette.

Started using Roxygen2 templates; still underused.

Added augment_cols utility function that will prove useful for reducing redundancy in augmenting functions.
Merge remote-tracking branch 'upstream/master'