Fix s:usable_shell being cleared whenever maktaba#system is sourced
Correct maktaba#system#Call vimdoc
Refactors maktaba#system into a builder pattern in maktaba#syscall
Fix bug trying to use list version of cmd as string in errors
Merge branch 'master' into syscall
Tweak style of vimdoc headers
Simplify s:DoSyscallCommon to not be a dict function
Change l:orig_cmd to l:orig_cmd_value to distinguish from syscall dict
Merge branch 'master' into syscall
Bump version to 1.3.0
Merge pull request #47 from google/syscall

Deprecates the maktaba#system API in favor of a builder-pattern implementation in maktaba#syscall