Seekbar, ProgressBar, GridView, Keyboard, Text color, Backgrounds, Partial text... and more!

• Fixes wrong error handling on assertDisplayed (#192)
• Adding interactions for SeekBar views (#182)
• Update readme look and feel (#191)
• Add keyboard interactions (#185)
• Fix the "not" section of the text color asserts (#190)
• Add with text color (#179)
• Create CODE_OF_CONDUCT.md (#189)
• Added support for GridView interactions (#188)
• Add assert not displayed with text (again) (#186)
• Add assertContains matcher (#170)
• Assert that a given View has a background, any background or no background (#174)
• BaristaSpinnerInteractions converted to kotlin (#180)
• Update readme (#177)