resume-en: bug fix, change from heiti to textbf
Add resume-common.tex for common information

Use it in resume-zh.tex and resume-en.tex
resume.bib: remove unnecessary information
resume.bib: remove one unnecessary reference
resume-en.tex:

- use \phantom to take up certain space instead of fixed width column
- Add more information in Working Experience, Project Experience Campus
  Experience and Awards
- Remove one unnecessary Research Experience
- Reorder some section
- Modify some detail expression mostly in Interests, Network Profile
resume-zh.tex:

use \phantom to take up certain space instead of fixed width column
resume-en.tex:

Bug fix to use native \LaTeX instead of raw LaTeX
resume-en.tex:

Bug fix for usage of \LaTeX
resume-en.tex:

Split reference in Research Experience to corresponding topic
resume-zh.tex: Change according to resume-en.tex

- use \phantom to take up certain space instead of fixed width column
- Add more information in Working Experience, Project Experience Campus
  Experience and Awards
- Remove one unnecessary Research Experience
- Reorder some section
- Modify some detail expression mostly in Interests, Network Profile
- Get rid of Chinese punctuation, use English ones everywhere
Remove pdf files
Add *.pdf in gitignore
README.md: modify pdf links in README
resume-common.tex: modify homepage url