context in 608
Implementation of DVB Subtitle
Some changes from Anshul
Upgraded png library source code to 1.6.10
dumping png file from dvbsub decoder using libpng
Changed version to 0.70a1
All changes pushed
Merge branch 'master' into anshul1912/master
Merge remote-tracking branch 'ruslan/makefile'
Merge remote-tracking branch 'ruslan/spupng'
spupng port to C (#19)
Merge branch 'rkuchumov/spupng'
Some changes to Makefile
Merge branch 'pr/n26_rkuchumov'
Removed Problem compiling c file in Visual Studio

Also moved -I include flags in INCLUDE variable since preprocessor
needs the location of header file, while compiling c to object file.

In src/dvb_subtitle_decoder.h added cpp guard

changed dvb cpp extension to c and removed some extra space at end of
line.
Merge remote-tracking branch 'upstream/master'
fix teletext detection by parsing all desc tag

Fix #20
Renamed all 608*.cpp to 608.c
Rename everything else to .c
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