Update binding-types.md

Add missing space
Clear up clunky intro sentence in databinding-advanced

@arthurevans PTAL
Fix indentation typo

Fixed inconsistent indentation of div tags on lines 65 & 67
indentation typo

<paper-shadow z="3"> was indented one space should be two spaces
Update path for post-service
Merge pull request #544 from Yahkob/patch-3

indentation typo
Merge pull request #543 from Yahkob/patch-2

Fix indentation typo
Fix typo and call out two-way value prop on select element
Updated link for polymerchromeapp
Merge pull request #541 from robdodson/master

Clear up clunky intro sentence in databinding-advanced
Merge pull request #545 from PendragonDevelopment/patch-1

Update path for post-service
Update README.md
Merge branch 'master' of https://github.com/Polymer/docs into sample-formatting

Conflicts:
	docs/polymer/binding-types.md