.gitignore and linting fixes

[Stealthii]

A .gitignore has been added with commonly accepted paths to ignore for Python and Git projects.

General linting changes have been made for PEP8 - commit description contains more information.

Before:

************* Module doxieapi
doxieapi/__init__.py:1:0: C0114: Missing module docstring (missing-module-docstring)
************* Module doxieapi.api
doxieapi/api.py:79:0: C0301: Line too long (101/100) (line-too-long)
doxieapi/api.py:81:0: C0301: Line too long (114/100) (line-too-long)
doxieapi/api.py:145:0: C0301: Line too long (102/100) (line-too-long)
doxieapi/api.py:1:0: C0114: Missing module docstring (missing-module-docstring)
doxieapi/api.py:23:0: C0115: Missing class docstring (missing-class-docstring)
doxieapi/api.py:23:0: R0902: Too many instance attributes (9/7) (too-many-instance-attributes)
doxieapi/api.py:105:35: E1101: Instance of 'LookupDict' has no 'ok' member (no-member)
doxieapi/api.py:131:11: C0121: Comparison to True should be just 'expr' (singleton-comparison)
doxieapi/api.py:145:12: W0707: Consider explicitly re-raising using the 'from' keyword (raise-missing-from)
doxieapi/api.py:208:40: C0103: Variable name "f" doesn't conform to snake_case naming style (invalid-name)
doxieapi/api.py:242:39: E1101: Instance of 'LookupDict' has no 'no_content' member (no-member)
doxieapi/api.py:266:39: E1101: Instance of 'LookupDict' has no 'no_content' member (no-member)
************* Module doxieapi.__main__
doxieapi/__main__.py:1:0: C0114: Missing module docstring (missing-module-docstring)
************* Module doxieapi.ssdp
doxieapi/ssdp.py:1:0: C0114: Missing module docstring (missing-module-docstring)
doxieapi/ssdp.py:27:8: C0103: Attribute name "st" doesn't conform to snake_case naming style (invalid-name)
doxieapi/ssdp.py:21:0: C0115: Missing class docstring (missing-class-docstring)
doxieapi/ssdp.py:21:0: R0205: Class 'SSDPResponse' inherits from object, can be safely removed from bases in python3 (useless-object-inheritance)
doxieapi/ssdp.py:23:8: C0103: Variable name "r" doesn't conform to snake_case naming style (invalid-name)
doxieapi/ssdp.py:21:0: R0903: Too few public methods (1/2) (too-few-public-methods)
doxieapi/ssdp.py:32:0: C0103: Argument name "mx" doesn't conform to snake_case naming style (invalid-name)
doxieapi/ssdp.py:32:0: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 7.98/10

After:

************* Module doxieapi.api
doxieapi/api.py:169:12: W0707: Consider explicitly re-raising using the 'from' keyword (raise-missing-from)
************* Module doxieapi.ssdp
doxieapi/ssdp.py:29:0: R0205: Class 'SSDPResponse' inherits from object, can be safely removed from bases in python3 (useless-object-inheritance)

------------------------------------------------------------------
Your code has been rated at 9.88/10 (previous run: 7.98/10, +1.91)

Other PyLint errors are already fixed in either #5 or #6.