[#6] Avoid removing files and directories specified with regexp patterns in "inkt.json" from the output directory.
[#7] The posting date is required in the front matter.
Merge branch 'develop' into feature/list-contents
Fix a problem that "iterationLine" always keep the next line in the buffer of a output channel.
[#7] List pages and articles but they are not sorted.
[#7] Sort pages by their posting date.
[#7] Sort article by their posting date and flush them.
[#9] Tell the generator whether a page has navigations for the next or the previous page.
[#8] Avoid copy of "static" directory if it doesn't exist.
[#8] Fix: Avoid copy of "static" directory if it doesn't exist.
[#10] Show the message which tells that Inkt exits successfully.
[#10] Rename "util.go" to "directory.go".
[#10] Create a version of "Directory" for temporaty directory.
[#10] "Directory.Clean()" remove the directory itself.
[#10] "OutputDirectory" is a type like "Directory" with temporary directory to write files.
[#10] Remove needless codes for error handling.
[#10] Fix: "Directory.Exist" should return true if the directory exists.
[#10] Read "post/" isntead of "article/".
[#10] Disable content-list generation.
[#10] Generate the list of posts.