Add links to filmstrip and graph comparison views from trendurl.php
Merge branch 'graph2'
Merge pull request #263 from geening/master

Add links to filmstrip and graph comparison views from trendurl.php
Fixed parsing of dev tools files that do not have a timeline associated
Fixed #266 - Added headerssize to the HAR export
# This is a combination of 9 commits.
# The first commit's message is:
Started to work on AB Statistical stuff

# This is the 2nd commit message:

Work on implementing a/b comparison

# This is the 3rd commit message:

Add files for a/b comparison

# This is the 4th commit message:

Fix graph_page_data

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Make graph_page_data.php handle multiple views

# This is the 6th commit message:

Multivariety Comparison

# This is the 7th commit message:

Support multiple statistical comparison control options

# This is the 8th commit message:

Fix bug in confidence interval computation

# This is the 9th commit message:

Add test list and label confidence intervals as 95%
A/B Statistical Comparison for graph_page_data.php
Add PHPStats information and move to different directory.
Merge pull request #269 from geening/master

A/B Statistical Comparison for graph_page_data.php
Move PHPStats lib to under www
Merge pull request #273 from geening/master

Move PHPStats lib to under www
Updated the WebPagetest version to be accurate
Updated the appurify API endpoint
Added NYI FTW to the list of known CDNs
Fixed a looping problem with the new background appurify code where getting a new access token would cause and infinite recursion.
Added some retry logic to the loading of settings, particularly for EC2 where the network might not be available right away.
wptdriver 182
Moved the settings loading and retrying into the background thread so it doesn't lock the UI
Fix computation of devtools Idle time

We were calculating the end-of-processing time using the *start* time of
the event that finished last, when we should instead be using the *end*
time of that event.
Merge pull request #277 from aroben/patch-1

Fix computation of devtools Idle time