Document each dataset in seperate .R files

[JustinMShea]

Get the Following Warning on build: invalid input found on input connection '~/R/FactorAnalytics/R/datasets.R'

Related to issue #35, concerning the r/datasets.R file.

Each data set needs to be broken out into separate .R files. Good examples for data set documentation can be found below

• https://github.com/JustinMShea/wooldridge/tree/master/R
• https://github.com/JustinMShea/neverhpfilter/tree/master/R

[JustinMShea]

@martinrd3D See example files in the above commit 3f04bb9

[JustinMShea]

@martinrd3D Received updates from CRSP and SPGMI on each data set, and adding to documentation accordingly.