code cleanup for interrupt description
adjust the format of document
fix compiling issue in Jz47XX
add comments to help understanding pthread
adding *~ to .gitignore
Update GCC porting of LPC178x
Merge pull request #62 from rogerz/pthread-comments

add comments to help understanding pthread
Merge pull request #61 from rogerz/gitignore

adding *~ to .gitignore
update to interrupt description
Merge branch 'master' of https://github.com/RT-Thread/rt-thread
implement a shell for module