Bump version number to 0.6.4-dev
Check documentation in CI
Merge pull request #33 from Motiejus/ci-doc

Check documentation in CI
Fix a typo
Fix #36: incorrect parsing of large unsigned decimal literals

All text formats -- Piq, Json and XML -- had this problem as they all relied on
the same buggy primitive for parsing unsigned decimals > 2^63 - 1
piqi compile: include .piqi filename as a field in the compiled spec
Preserve the original int, float and string literals in embedded JSON
Add --strict flag to call, getopt and to-proto subcommands

When specified, unknown and duplicate fields (in case of to-proto) and options
(in case of call and getop) are treated as errors rather than warnings.
(piqi) Add a new `json-omit-missing` field property

This optional setting controls whether to omit missing fields from JSON output
that would otherwise be represented as JSON NULL for missing optional and []
for missing repeated fields; if not specified, the default behavior is
determined by the json_omit_null_fields run-time setting which is, in turn, set
to true by default.
Move documentation link checking from travis-ci to doc/check-links
piqi-0.6.5 release
Bump version number to 0.6.5-dev
Add travis-ci build status image
Fix "make -C tests" when protoc is not available