restruct Erlang library directory
rewrite subdir and default target
restruct libsrc
copy executable file to bin directory
support environment variable BRAN_LIBS
show error message when no input files
fix test target
add Erlang/OTP installer script for CircleCI
recompile with Erlang/OTP 17.3
fix cache otp
remove useless command
add installation guide
Merge branch 'feature/install' into develop