Fix for #814, Memory Leak

File isn't closed before being released, it leaks. This test has been verified and tested many times.
Fix indentation (cosmetic)
Merge pull request #1608 from supcik/fix_indent

Fix indentation (cosmetic)
Merge pull request #1383 from bjelojac/patch-1

Fix for #814, Memory Leak
It was still using jdk FileNameExtensionFilter
Added missing class FileNameExtensionFilter
Removed destructor from File.cpp and SD.h as it leads to unexpected close/destructed objects #814
Update readme.txt
Display line numbers for the file being edited
add preference to enable/disable line numbers

add preference to enable/disable line numbers and make font change work
Render line numbers using TextAreaPainter

Fix the line number font rendering problem on the Mac.

Now, the TextAreaLineNumbers class extends the TextAreaPainter and just
overloads the paintLine method to make it render the line number instead
of rendering the whole line. Other than that, the superclass' drawing
code is used.

So: the same drawing code that renders the source code text in the
editor is now also being used to render the line numbers.
Added Arduino Ethernet variant.

Fixes #925
Added LED_BUILTIN constant to Leonardo board
Changed LED_BUILTIN to a macro to better support boards that do not have a built-in LED.

Fixes #758
Help 3rd party installers find the hardware path
Merge branch 'cayci-master'
Updates to a number of Examples

removed pachube examples, added xively examples. changes to the Servo
examples