improve zoom control design (refining @jacobtoye's work)
rename top/bottom to first/last in control classes, thanks @yohanboniface
simplify toolbar classes
make toolbar styles more generic
Using hex color instead of rgba to support oldie.
Removing unnecessary ie only styles.
Merge pull request #1313 from jacobtoye/control-design

IE fixes for new control styles.
Merge remote-tracking branch 'origin/control-design'

# By Vladimir Agafonkin (4) and jacobtoye (2)
# Via Vladimir Agafonkin (1) and jacobtoye (1)
* origin/control-design:
  Removing unnecessary ie only styles.
  Using hex color instead of rgba to support oldie.
  make toolbar styles more generic
  simplify toolbar classes
  rename top/bottom to first/last in control classes, thanks @yohanboniface
  improve zoom control design (refining @jacobtoye's work)