Merge pull request #15 from harsha2010/master

cleanup

Merge pull request #13 from HaseebR/patch-1

Update edm-per.cpp

Merge pull request #11 from putnam120/patch-2

Fixed null iterator error

Update edm-multi.cpp

Update Travis CI build to point to Twitter

correct capitalization

add travis.yml for Travis-CI support

one char change

define a default value for t1 which R CMD check mistakenly suspects to be uninit.

define a few variables which R CMD check mistakenly sees as globals (when used in ggplot)

added so that R CMD check does not see LICENSE

Updating README