Linter fixes:
- E123 closing bracket does not match indentation of opening bracket's line
- E125 continuation line with same indent as next logical line
- E231 missing whitespace after ','
- E265 block comment should start with '# '
- E302 expected 2 blank lines, found 1
- E305 expected 2 blank lines after class or function definition, found 1
- E731 do not assign a lambda expression, use a def
- F401 imported but unused
- F821 undefined name
- W605 invalid escape sequence
Also removes a Python 2 reference from the README.md
- E129 visually indented line with same indent as next logical line
- E226 missing whitespace around arithmetic operator
- E241 multiple spaces after ','
- E262 inline comment should start with '# '
- E301 expected 1 blank line, found 0
- E303 too many blank lines
- E502 the backslash is redundant between bracket
- E741 ambiguous variable name
- W391 blank line at end of file
- installs cutting edge version from current source
- removes outdated java version fixes
- migrates to host Python3
- verifies the image builds and run via Travis
- fixes minor linting: "E117 over-indented"
- run setup.py on both Python2 and Python3
- runs simple test case for both Python2 and Python3
- checks the PEP8 style
- updates README.md adds Travis badge
