Merge pull request #11 from snickers2029/develop

quick fix, fix issue in pull request #9
no changes
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added findshortest path for k value, moved gdb, DB_Path fields from Controller to FinderSteven.java
add error handler(incomplete)
Update README.md
Update README.md
add basic error handler
add shortest path, some bugs are handled(not final version)
Merge pull request #14 from HaoranHuang/develop

add shortest path for k-value, some bugs are handled(not final version)
fixed connects=0 bug