Required changes to align with cpplint 2.0

[matyalatte]

Currently, cpplint-cpp conform to an untagged version of cpplint.py. It would be better to merge the following changes to conform with cpplint 2.0.

• Use standard fixed-width typenames for cast checks. (cpplint/cpplint@b2d18ad)
• Disable readability/fn_size by default. (cpplint/cpplint@820df48)
• Fix false positive on concept declaration. (cpplint/cpplint@b29d3ee)

[matyalatte]

cpplint-cpp now conforms to cpplint 2.0.

• Disabled readability/fn_size by default. (Disable readability/fn_size by default #14)
• Cast checks now uses standard fixed-width typenames. (use standard fixed-width typenames for cast checks #15)
• Fixed false positives on concept declaration. (Fix false positive on concept declaration #16)