Keyboard support in "Person" dropdown

[pragyanone]

Please consider adding keyboard support in "Person" dropdown of "Create Transaction" page.

As of now, the "Person" list is sorted but with a long list, scrolling down is a bit inconvenient.

[Marmo]

Note to self: need to implement a custom adapter that supports filtering. https://stackoverflow.com/questions/13369962/android-spinner-narrow-by-keyboard