disable web sync if syncModel is none
refactor(config): remove adaptScope config key
ungrade koa-markdown to use remarkable, close #482
Merge pull request #490 from cnpm/issue482-remarkable

ungrade koa-markdown to use remarkable, close #482
fix(module_log): limit module sync log size to 1MB

If log size bigger than 1MB, it will be auto slice to 0.5MB
Merge pull request #488 from cnpm/limit-log-size

fix(module_log): limit module sync log size to 1MB
Release 2.0.0-beta0