fixes #12

added stringify_ids="true" to deal with 64 bit user IDs

fix in getTimeline (thanks @jlegewie)

Merge pull request #9 from jlegewie/patch-1

Re-authenticate after changing credentials

fix token not changing in searchTweets

remove commented line

other minor fixes

adds searchTweets function + bump to v0.5

fixes duplicated unlistWithNA function error

remove unnecessary line breaks in get* functions

bump to version 0.4

added getRetweets function

added searchUsers function

fixes NA error in getUserBatch