Merge pull request #39 from jread-usgs/master

.gitignore mods
tested examples and found small typo
Merge pull request #40 from jread-usgs/master

update to v0.2.2 "set" methods
small change in the lakes example to make it work
added instructions for installing using devtools install_github
Merge pull request #41 from sckott/master

Made a small change to one eg to make it work and added line about devtools install
Merge remote-tracking branch 'upstream/master'