added roles parameter to getUsers

Closes #3.
merged getNewUsers into getUsers

optional parameter `daysToCheck` allows for getting new accounts
Merge pull request #19 from ecaldwell/master

enhanced getUsers function
Update arcgis.com to www.arcgis.com
addNewUsersToGroups.py throwing error

error in user list being sent to admin.py. ERROR; throwing expecting
string getting dict. Also admin.py had wrong key (groupid) in
addUsersToGroup toolSummary.append should be group
Merge pull request #21 from pwilkebrown/samples

addNewUsersToGroups.py throwing error
Update utilities.py

Added updatewebmapversionAGX method for reverting web map version to 1.7x
Create updateWebMapVersionAGX.py

Update web map version to 1.7x
Allows for opening new web maps in ArcGIS Explorer
Intended use is if you need to use AGX to create queries for iOS devices
fixing spaces and indentations
updated folderID method (much faster!)

Making good use of the ‘ownerFolder’ property in the item description
rather than looping through everything looking for a match.
Merge pull request #23 from ecaldwell/master

add UpdateWebMapVersion from and update the folderID method
closes #22
merge from upstream master