Improved autotune instructions.
Fixed path in command to copy the SDL.dll
Android PFD and SystemAlarms: Ensure that objectUpdated is not called for a null object

Both SystemAlarms and PFD (fragments) are getting a connected signal and then not finding
objects that should exist (SystemAlarms and AttitudeActual respectively).  This is probably
when connected to an unknown UAV type and should be handled gracefully like now.
However, it would be good to confirm this doesn't happen when connected to a known
UAVO set.

fixes #203
Windows Packaging: Including libstdc++-6.dll

I'm not sure why this wasn't required previously or causing
other issues but including it resolved an issue for Al.
Linux Packaging: Don't use sudo for postinst

Since the whole packaging installation runs as root
calling sudo is unnecessary.
Replaced required slash.
Classed hardware settings into subtree. This reduces the number of
elements in the top tree of the UAVO Browser.
Merge pull request #204 from PhoenixPilot/james/windows_libstdc++

Windows Packaging: Including libstdc++-6.dll
Merge pull request #205 from PhoenixPilot/kenz/hardware_settings_subtree

Classed hardware settings into subtree. This reduces the number ofelements in the top tree of the UAVO Browser.
Corrected eraseDone() message. Added additional dialog box to better
inform the user.
Bug fixes in LSM303 driver.

1) The acceleration mg/LSB was incorrect for +-16G.
2) Two register values in Accel Ctr4 were incorrect.
Added space as per review comment.
Merge pull request #212 from PhoenixPilot/kenz/lsm303_fixes

Bug fixes in LSM303 driver.
Added link to autotuning video.
Open and Retrieve buttons no longer stay enabled while uploader is flashing firmware.
Changes to make the AltitudeHold module work as an optional module
Fixed errant capitalization.
Minor adjustment to text. Updated TODO to make it clearer that it's
unlikely we'll be able to tell a priori how much time an erase operation
will take.
Changed to make the PathPlanner module work as an optional module.
Merge pull request #211 from TauLabs/kenz/gcs_erase_NVRAM_dialog

Corrected eraseDone() message. Added additional dialog box to better inform the user.