Merge pull request #15 from davharris/master

colored pairs plot for outlier detection
Updated author list again
added file extension for test_NA
function for testing continuous date range
updated documentation
documentation updates
add spelling.R
Merge branch 'master' of https://github.com/ropensci/testdat

# By Alyssa Frazee (3) and others
# Via Alyssa Frazee (1) and Karthik Ram (1)
* 'master' of https://github.com/ropensci/testdat:
  documentation updates
  updated documentation
  function for testing continuous date range
  added file extension for test_NA
  Updated author list again