Update HelloWorld.ino

Adding power connections, just to be thorough
Merge pull request #2162 from ankitdaf/patch-2

Update HelloWorld.ino - Added two lines for documentation
Remove unused variable from ethernet socket utils

Remove the variable 'status' as this had a value assigned (from readSnSR),
but it was never used.
Cast empty string to char* to fix compiler warning

Stream::find(char *target) passes an empty terminator string to
Stream::findUntil(char *target, char *terminator) which caused a compiler
warning with the updated toolchain, so cast it to a char*.
Add availableForWrite() to HardwareSerial
modified sentences in library.properties files
missing paragraph field in library.properties
Merge pull request #2193 from PaulStoffregen/ide-1.5.x

Add availableForWrite() to HardwareSerial
Merge pull request #2190 from ribbons/compiler-warnings

Fix two compiler warnings generated by updated toolchain
SPI: remove duplicate BarometricPressureSensor example
Merge pull request #2194 from Fede85/ide-1.5.x_lib-description

Ide 1.5.x lib description
fixed some broken links in library.properties files
Merge pull request #2201 from Fede85/ide-1.5.x_lib-description

fixed some broken links in library.properties files
Fix of a bug
Fix of a spelling mistake
Fixed wrong return value in FileIO::size()

Fixes #2203
Merge pull request #2206 from amulya349/master

Fix of a bug #2199
Merge remote-tracking branch 'arduino/master' into ide-1.5.x
Merge pull request #2195 from pmjdebruijn/duplicate-example

SPI: remove duplicate BarometricPressureSensor example
Merge branch 'feature/Search_and_replace_improved_dialog' of github.com:eried/Arduino into eried-feature/Search_and_replace_improved_dialog