Pyarmor

* Remove unused files in distribute package

In this version, new obfuscate mode 7 and 8 are introduced. The main
difference is that obfuscated script now is a normal python file (.py)
other than compiled script (.pyc), so it can be used as common way.

Refer to [src/mechanism.md](src/mechanism.md)

* Introduce new mode: 7, 8
* Change default mode from 3 to 8
* Change benchmark.py to test new mode
* Update webapp and tutorial
* Update usage
* Fix issue of py2exe, now py2exe can work with python scripts obfuscated by pyarmor
* Fix issue of odoo, now odoo can load python modules obfuscated by pyarmor

* Fix issue: the traceback of an exception contains the name "<pytransform>" instead of the correct module name
* Fix issue: all the constant, co_names include function name, variable name etc still are in clear text.
Refer to https://github.com/dashingsoft/pyarmor/issues/5

From this version, a new obfuscation mode is introduced. By this way, no import hooker, no setprofile, no settrace required. The performance of running or importing obfuscation python scripts has been remarkably improved. It's significant for Pyarmor. Refer to [src/mechanism.md](src/mechanism.md)

* Use this new mode as default way to obfuscate python scripts.
* Add new script "benchmark.py" to check performance in target machine: python benchmark.py
* Change option "--bind-disk" in command "license", now it must be have a value

* Add option "--bind-mac", "--bind-ip", "--bind-domain" for command "license"
* Command "hdinfo" show more information(serial number of hdd, mac address, ip address, domain name)
* Fix the issue of dev name of hdd for Banana Pi