Update devices/AVR8.c

fixed SS pin of an AVR set to output to prevent the master for all devices
changed contrast to hex, makes sense as the other constants are also hex
Update controllers/PCD8544.c

changed line 54 to be correct
instead of
glcd_command(PCD8544_SET_VOP | (val|0x7f))
should be
glcd_command(PCD8544_SET_VOP | (val&0x7f))
Merge pull request #1 from Mircho/master

- Initialization of the SS pin should be done for all devices
- The void glcd_set_contrast(uint8_t val) method for PCD8544 had some wrong ORing instead of ANDing
- Thanks to Mircho for the fixes
Cosmetic changes
Extra commands for ST7565R
Change VOP for PCD8544
Set AVR SS pin as output for SPI LCDs
Plus other minor cosmetic changes
Merge branch 'master' of github.com:andygock/glcd
Allow adjustment of reset time by defining symbol for compiler.
Switched to Markdown flavoured README
Switched to Markdown flavoured README
Merge branch 'master' of github.com:andygock/glcd
Add comment defined symbol
Improve comments
_delay_ms() now works with "new implmentation" avr-gcc
Support for displaying bitmap images
Make bitmap pointer const
Included missing headers
Supporting AVR, bitmaps in pgmspace (untested yet)
Update README.md