minor edits (mainly indentation)
minor edits to control structures
Highlighted that ifelse is useful because it is vectorized.
minor edits to scoping
Moved example of parent environments directly below the text that describes it. Also added example of how to find the environment where a function is defined.
Fixed file path.
Minor edits to messy-data.
Added extra displays of the data so that it is easier to follow the html version.
Fixed file paths.
The iris dataset was not loaded during the data-manipulation section. The code would still work since R will find iris in the attached package. I just have them load it into the global env with data, but an alternative option would be to use it as an opportunity to reiterate scoping.
Added more displays of objects in apply lecture.
Added short definitions of apply family functions.
Minor edits to apply lesson.
Merge pull request #37 from jdblischak/data-manipulation

Data manipulation
Merge pull request #33 from jdblischak/functions

Functions
Updated ignore list
Added mammals.csv (previously people read this data file off the web), fixes 36
Added mammals.csv (previously people read this data file off the web), fixes #36
Merge branch 'gh-pages' of https://github.com/karthikram/bc into gh-pages