Added Leiningen and run directions to READ.md...

Since these directions are recommended, I added them to the README for a better starting place for potential developers. Also added a direction for running the scripts.
Updated pull request #1291 

added the link to the Windows installer
make the close tab button look nice

Signed-off-by: Chris Granger <ibdknox@gmail.com>
Merge pull request #1308 from piyush0101/master

Adding a command to close all tabs
Merge pull request #1291 from statesside/patch-2

Added Leiningen and run directions to READ.md...
don't let the mac menu only partially pick up keyboard shortcuts

Signed-off-by: Chris Granger <ibdknox@gmail.com>
Change cursor to pointer for plugin install / uninstall / update
Adding a command to close tabs except current tab
Adding a command to move tab to new tabset
Adding a menu item to move tab to new tabset
Add ellipsis to truncated results
Add setting for number of files indexed by the navigator

User may add `(:lt.objs.sidebar.navigate/set-file-limit n)`, with n
integer, to customize the maximum number of workspace files that will be
indexed by the navigator for each top workspace folder.
Defaults to 8000.
Merge pull request #1317 from seancaffery/sean/plugin-button-hover

Change cursor to pointer for plugin install / uninstall / update
Merge pull request #1336 from ndr-qef/ellipsis-on-truncation

Add ellipsis to truncated results
Merge pull request #1337 from snufkon/move-new-tabset

Adding a menu item to move tab to new tabset
Merge pull request #1325 from snufkon/add-close-others

Adding a command to close tabs except current tab
Merge pull request #1340 from ndr-qef/nav-index-limit

Add setting for number of files indexed by the navigator
Adding a set-line function to editor.cljs