Hope there's no bug...#3

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jingfei wants to merge 11 commits intoembedded2015:masterfrom

Commits on Sep 22, 2015

Enhance arm code for lab-1 & lab-1i, add c code for testing
jingfei
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Commits on Sep 23, 2015

Change subroutine's pushed registers, according to AAPCS
jingfei
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Commits on Sep 25, 2015

Move lab-1 C code to directory "lab-1-c". Use gprof and gnuplot to analysis.
jingfei
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Commits on Sep 26, 2015

Correct result's data and picture by the wrong format.
jingfei
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Commits on Oct 14, 2015

Create README.md
jingfei
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