同步develop最新的修改到power版本

add travis ci yaml file for auto build by travis-ci service.

add appveyor ci support

fix local variable 'size' hides a parameter of the same name

remove unused comparison with 0 as vid >=0 htons() return

remove unused comparison with 0 as refCount >=0 always.

support the arithmetic calculation of aggregation between different s…

fix the issue that deref pNew pointer after free

fix two few arguments in vnodeRead.c

fix two few arguments in tudp.c

remove one parm should be not there.

[#1343]

[modify default value of talbes of per vnodes.]

Fix file handler remains on return

fix out-of-bounds read arrary data_type[]

[TBASE-1550]

invalid memory write while authorization failed

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