fix innerJoin
upgrade for mesos 1.8
rdd.update: compatible with duplicated keys
unittest for rdd.update with duplicate keys
remove dup import
remove extra whitespace
Update README.md

add travis link
remove useless code and blank
add psutil as dependency
remove hardcoded master for drun
add Dockerfiles
dpark.conf 添加 MEM_PER_TASK 选项
compatible with segmented gzip file
force use dpark's logging configuration
fix env bug
use custom logger instead of root logger
fix missing end char
fix serialize bug
sometimes sys.stderr may have no isatty method

For example in DAE sys.stderr is an instance of StreamWrapper.
make pymesos a separate package & support mesos 0.20