button: add getText()/setText() methods (close #418)
Merge pull request #419 from bem/issues@418v2

add getText()/setText() methods to button
Infrastructure improvements. Closes #382
Merge pull request #383 from bem/issues/382@v2

Infrastructure improvements
popup: border => box-shadow
input: border => box-shadow
button: border => box-shadow
checkbox: border => box-shadow