Fix bugs about range request and explorer crashes

1. fix a bug that when header contains "Range: 100-", the range request
support will fail
2. (windows) fix a bug that when explorer.exe crashes due to some
reason, the tray icon will disappear.
Updated readme
Added sqlite to linux_lua target
Added Lua section to the user manual
Updated Lua section in user manual
add lua page example with the form submitting
update README.md
Merge pull request #111 from dpsk/lua_docs

Lua docs
Updated dates
Merge pull request #106 from BusyJay/feature-2

Fix bugs about range request and explorer crashes
Merge pull request #102 from abadc0de/master

Better error handling and an include function for lua pages
Removed header printing from page.lp
Merge https://github.com/valenok/mongoose