Merge pull request #67 from aaroncampf/master

Added Features
System Plugin File Structure change.
Fix issues in 636350c3952daa62346f49f790035aa2c5082727
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Use a better method to calculate relative coordinates while moving among screens
Add restart wox command into sys plugin.
Merge branch 'master' of https://github.com/qianlifeng/Wox.git
Merge branch 'master' of https://github.com/qianlifeng/Wox
Added Plugin for searching additional directories
Upgrading Features

Now Parent folder will appear in search results.
fix null references issues in commit 6b9f96697bb53f38ad01a11dee7ae9ef05924e72 @aaroncampf
Removed FileSystemSourceShallow
- added option to open Wox Settings from the tray menu

- added a checkbox option specifying whether to leave the command line open after having run a command like >ping google.com
Merge pull request #73 from kerams/master

Opening Settings from tray and the ability to leave the windows command prompt open after running a command
Feature: Added WindowOpener class, which prevents having duplicate windows of the same type opened at the same time
Merge pull request #74 from kerams/master

WindowOpener class
Added PeHeaderReader class, which is used to check whether an application is CUI. This fixes the issue introduced in e0eb8c8.
Merge pull request #75 from kerams/master

PeHeaderReader class, fixed bug in e0eb8c8
Fix python plugin crash issues.
close #65 Hide when app loses focus