Merge pull request pywinauto#526 from vasily-v-ryabov/fix_set_focus

Fix set_focus() for UIA backend

Merge pull request pywinauto#457 from vasily-v-ryabov/release_0.6.4

Prepare release 0.6.4

Merge pull request pywinauto#383 from vasily-v-ryabov/UIA

Final preparations for 0.6.3

Merge pull request pywinauto#320 from vasily-v-ryabov/UIA

Add MS Paint example (fix pywinauto#310).

Merge pull request pywinauto#304 from MagazinnikIvan/fix_alt_test

fix keyboard alt test failure

Minor update in setup.py.

Update README.md.

Update links to 0.5.3 in README.md.

Update readme, fix grammar in docs.

Update docs for 0.5.1.