#3 first version of this activity

using fragment, visible aslo together with list in landscape layout
#2 first basic Creation Activity

now only creates menu, and prints message about creation/editacion
#1 main activity with list of formulas

using fragments, in landscape layout displays also fragment to calculate
formula
#1 list fragment for main activity

and needed stuff
#1 #2 #3 updated xml
** first Formula impl

does nothing, just example
** files changes after updating gradle
#1 search widget only supported from sdk 11

and nothing similar is in support library