Renaming atmega168 bootloader directory to atmega since it's no longer atmega168 specific. Updating boards.txt accordingly.

hardware/boards.txt

@@ -28,7 +28,7 @@ atmega168.upload.speed=19200
 atmega168.bootloader.low_fuses=0xff
 atmega168.bootloader.high_fuses=0xdd
 atmega168.bootloader.extended_fuses=0x00
-atmega168.bootloader.path=atmega168
+atmega168.bootloader.path=atmega
 atmega168.bootloader.file=ATmegaBOOT_168_ng.hex
 atmega168.bootloader.unlock_bits=0x3F
 atmega168.bootloader.lock_bits=0x0F
@@ -48,7 +48,7 @@ mini.upload.speed=19200
 mini.bootloader.low_fuses=0xff
 mini.bootloader.high_fuses=0xdd
 mini.bootloader.extended_fuses=0x00
-mini.bootloader.path=atmega168
+mini.bootloader.path=atmega
 mini.bootloader.file=ATmegaBOOT_168_ng.hex
 mini.bootloader.unlock_bits=0x3F
 mini.bootloader.lock_bits=0x0F
@@ -89,7 +89,7 @@ diecimila.upload.speed=19200
 diecimila.bootloader.low_fuses=0xff
 diecimila.bootloader.high_fuses=0xdd
 diecimila.bootloader.extended_fuses=0x00
-diecimila.bootloader.path=atmega168
+diecimila.bootloader.path=atmega
 diecimila.bootloader.file=ATmegaBOOT_168_diecimila.hex
 diecimila.bootloader.unlock_bits=0x3F
 diecimila.bootloader.lock_bits=0x0F
@@ -109,7 +109,7 @@ nano.upload.speed=19200
 nano.bootloader.low_fuses=0xff
 nano.bootloader.high_fuses=0xdd
 nano.bootloader.extended_fuses=0x00
-nano.bootloader.path=atmega168
+nano.bootloader.path=atmega
 nano.bootloader.file=ATmegaBOOT_168_diecimila.hex
 nano.bootloader.unlock_bits=0x3F
 nano.bootloader.lock_bits=0x0F
@@ -149,7 +149,7 @@ pro.upload.speed=19200
 pro.bootloader.low_fuses=0xc6
 pro.bootloader.high_fuses=0xdd
 pro.bootloader.extended_fuses=0x00
-pro.bootloader.path=atmega168
+pro.bootloader.path=atmega
 pro.bootloader.file=ATmegaBOOT_168_pro_8MHz.hex
 pro.bootloader.unlock_bits=0x3F
 pro.bootloader.lock_bits=0x0F
@@ -169,7 +169,7 @@ atmega328.upload.speed=57600
 atmega328.bootloader.low_fuses=0xFF
 atmega328.bootloader.high_fuses=0xDA
 atmega328.bootloader.extended_fuses=0x05
-atmega328.bootloader.path=atmega168
+atmega328.bootloader.path=atmega
 atmega328.bootloader.file=ATmegaBOOT_168_atmega328.hex
 atmega328.bootloader.unlock_bits=0x3F
 atmega328.bootloader.lock_bits=0x0F