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Send an USB remote wakeup if data need to be written

To allow sketches to override value as per #58.

Speed and size improvement in Print::printFloat()

Add getTimeout accessor method.

On Linux, setting autosuspend_delay_ms to N and control to auto allows the host pc to suspend the peripheral. Some Linux distro (Ubuntu, Mint) apply this behaviour by default.
If the sketch's prints where less frequent than N milliseconds the sketch prints would never arrive.
This patch allows sending a remote wakeup event to unsuspend the peripheral and allow the serial prints to be received.

Subtract one from USB_EP_SIZE in USB_SendSpace

SAM: Add Serial_::availableForWrite

Add PIN_* defines to AVR variants

Port SDA and SCL symbols to SAM

Fixes that more complex methods (like Stream::print(float)) do not work properly.

Without this fix, Wire.print(1.01f); results in '1' because Print::printFloat(double, uint8_t) performs multiple print() and therefore twi_transmit calls. Also Wire.println("Heyho"); results only in a newline character.

In an excess of confidence, these defines were added to Leonardo's variant.h
3rd party boards sometimes avoid inheriting this variant but they still define USBCON, thus breaking the build

Merge branch 'sam-recipe_ar_pattern-backwards-compatibility' of https://github.com/sandeepmistry/Arduino

As I was not able to base the return types of `begin()` & `end()` off the c_str() function, I have changed the source so the features can be used by C++98 code, while still allowing ranged loops in C++11.

This will allow using the String library in a ranged for loop:

```C++
String s = "Hi, this is a test";

for( char c : s )
  Serial.print( c );
```

This avoids dealing with ZLP’s in USB_Send, because the max packet size
will be EP size - 1.

Replaces #4280, only checks for the bootloader once

Tested with Hoodloader2, should work with every LUFA-derived bootloader released after 2014 (.apitable_signatures section must be placed at end of the flash)

BootloaderAPITable.S :

.global BootloaderAPI_Signatures
BootloaderAPI_Signatures:

    .long BOOT_START_ADDR ; Start address of the bootloader
    .word 0xDF00 ; Signature for the CDC class bootloader
    .word 0xDCFB ; Signature for a LUFA class bootloader

makefile:

BOOT_API_LD_FLAGS    += $(call BOOT_SECTION_LD_FLAG, .apitable_signatures,  BootloaderAPI_Signatures,  8)

AVR recipe.ar.pattern backwards compatibility

Corrected comments of rx and tx in a SoftwareSerial example.

Add missing cast to SoftwareSerial::peek() when returning buffered value

Define archive_file_path in Arduino AVR Boards platform.txt to provide
backwards compatibility with IDE versions previous to 1.6.6. The
archive_file_path value set in platform.txt is overridden in IDE 1.6.6+.
This produces avr-ar commands identical to the previous behavior.

- Remove comment in Arduino AVR Boards platform.txt about -w flag. This
is no longer relevant since the compiler warning level is now set by the
user.
- Fix typos