Merge pull request #20 from ym/master

修正了一些由 autorelease 导致的问题并处理了一个潜在的内存泄露
enhancement: display lyrics in shadow style text.
Merge pull request #23 from kmwang/shadow-lyrics-6

enhancement: display lyrics in shadow style text.
support 10.9 and add prefs setting to shadow lyrics
ask for donation again and update app version
skip DynamicLyricsHelper install
code sign app
support retina display
Fix: Message window hide too fast when change song continually
Merge pull request #30 from Madimo/master

Fix: Message window hide too fast when change song continually
post the lyrics to server in order to analize a better lyrics solution in future
post the search result to server in order to analyze a better lyrics solution in future
will this become a better performance in retina display
new function: two-line desktop lyrics
a better two-line display effect
update software version
change menu "About DynamicLyrics" to system default
disable menubar lyrics when first launch dynamiclyrics
new function: prefs for two rows lyrics
update Chinese donation details