Improving rect drawing 

Fix calculation of final drawBit in drawVerticalLine

Calculating `strWidth` in drawStringMaxWidth correctly

Fixing display bounding check in `drawVerticalLine`

Fix broken switchToFrame/transitionToFrame condition

Add support for SH1106

Fix detection of non drawable characters

Implement frame control function proposed in #54

* dev-branch-3.0.0: (45 commits)
  Rename SSD1306 to OLEDDisplay
  Typo fixes, linked Upgrade Guide to README
  Add info about text logging feature
  Add initial draft
  Implement proper scrolling
  Implement basic Print interface #35
  Updated the README file with missing API functions
  Fix remaining issues discussed in #26
  Fixe typo
  Added section about hardware abstraction
  Fixes discussed in #26
  Reset state values when calling setFrames Fixing #34
  Always install time lib
  Add `ClockDemo` to travis build
  Update examples
  Add abstraction for hardware interface
  Add optional support for using brzo as i2c lib
  Added digital clock example using drawLine and drawCircle
  Quick hack to set currentFrame at 0 when calling setFrames. Allows multilevel navigation.
  Removed ino files from build path
  ...

Upgrade Guide from 2.0 to 3.0