effective memory mgmt - updated docs for devtools 

New name for Heap Allocation Profiler and related adjustments.
Automatically updating the calendar
Adding <picture> element (responsive images) article
Merge pull request #1211 from pearlchen/picture-element

Adding <picture> element (responsive images) article
Merge pull request #1210 from agektmr/ja_locale_po

Updates for Japanese language resource file
Got rid of HTML entities around <picture> and <img>

Since they look like they are already escaped.
Merge pull request #1214 from pearlchen/master

Got rid of HTML entities around <picture> and <img>
Added link to Web Fundamentals images guide home.
Merge pull request #1215 from pearlchen/master

Added link to Web Fundamentals images guide home.
Automatically updating the calendar
Automatically updating the calendar
Automatically updating the calendar
change "Webkit" to "WebKit"
Automatically updating the calendar
Merge pull request #1218 from Glowin/issuse1217

change "Webkit" to "WebKit" fix #1217
Automatically updating the calendar
add CSS Shapes article; ref #1145
Merge branch 'master' into shapes

Conflicts:
	database/tutorials.yaml
Merge pull request #1220 from oslego/shapes

Add CSS Shapes article
Renaming image