fixed typo and added website access dates
added help popup class
added help button to main view
added help text
Merge branch 'master' into mywallet

Conflicts:
	plant.kv
added gear image for settings button
Merge pull request #17 from adasilva/icons

added gear image for settings button
Merge pull request #16 from adasilva/mywallet

Help Screen - issue #7
changed the size of the popup
centered the help text
Merge pull request #19 from adasilva/mywallet

improve help window
add help icon
deleted help icon
resolving conflicts from previous merge