fixed bsp/frdm-k64f gcc compile
Merge branch 'master' into k64f-frdm
Merge pull request #291 from geniusgogo/k64f-frdm

K64f frdm
[Drivers] Make code cleanup in serial framework.
[Kernel] Remove rt_device_init_all implemetation.
[Finsh] Fix command line size issue in finsh.
Merge branch 'master' of https://github.com/RT-Thread/rt-thread
Merge pull request #297 from hduffddybz/master

add some comments of lwip porting
[bsp] Change the output files directory in LPC2478.
[build] Update travis.yml configuration file
Merge branch 'master' of https://github.com/RT-Thread/rt-thread
[bsp] Remove none-released bsp
[bsp] Remove NUC140 porting
[bsp] Fix frdm-k64f compiling issue
[bsp] Remove none-released porting
[build] Add frdm-k64f into travis-ci building
[build] Remove the un-supported porting in the building
[Kernel] system does not lock scheduler when invoking soft-timer timeout function.
[Doc] Add Change log in Chinese.
[Drivers] Add workqueue implementation.