Bump up version number to 0.5.1-DEV
Search static header table linearly
Use gcc-4.9 for travis build
Revert "Use gcc-4.9 for travis build"

This reverts commit 8207dd33b7ac19bd501c8b166cf0018be157576c.
Fix integer decoding when it takes multiple reads
Remove unnecessarily code
Handle header table size up to UINT32_MAX
Bump up version number to 0.5.1, LT revision to 4:1:0
Update man pages
Bump up version number to 0.5.2-DEV
Fix wrong detection of neverIndex bit
Extend frame length field to 24 bits
Remove HPACK reference set
Don't copy static header and put static table in front of dynamic table
src: Remove 0x00 concatenation for headers

Now concatenating header values with 0x00 as delimiter is not
necessary because HPACK reference set is removed and the order of
header field fed into HPACK encoder is preserved when they are
decoded.
Remove unused role member in nghttp2_hd_context
Remove ent_name member and use index solely
Don't ignore aux_data for HEADERS with NGHTTP2_HCAT_HEADERS tag
nghttpx, nghttpd: Support non-final response
Update doc