Remove flexbox properties

Flexbox properties on button elements caused them to loose the ability to have their text center aligned. Removing the flexbox properties restores the ability to align text as you please.
Revert "Remove flexbox properties"

This reverts commit eb95d3fe404f3ac4ef27a8f44bfc53d1898eb1eb.
Add consistent line heights and fix missing semi-colon
Merge pull request #23 from mobify/improve-dir-structure

Improve directory structure
Fix _grid.scss comment to reflect how the c--{n}up class is actually written
Merge pull request #30 from mobify/fix-grid

Fix Grid component docblock showing wrong naming convention.
Remove flexbox to correct misaligned text. Fixes #26.
Button component - Normalize border-radius across element types in iOS.
Ensure page has top and bottom margins in iOS.
Add attribution and consistent attribution formatting to components.
Use border variables from Vellum as defaults.
Add Gruntfile to bower’s ignore list.
Merge pull request #32 from mobify/components-button

Button component – Fix text alignment bug.
Merge pull request #33 from mobify/components-button-radius

Button component – Normalize border-radius across element types in iOS
Merge pull request #34 from mobify/fixture-css

Fixture CSS – Miscellaneous fixes
Merge pull request #35 from mobify/attribution

Add attribution.
Merge pull request #39 from mobify/bower-ignore

Add Gruntfile to bower’s ignore list.
Add a brief "How to install" explanation
Change installation to match instructions in PR 36
Merge branch 'master' of github.com:mobify/stencil into phantomcss

Conflicts:
	README.md