Hough standard transmission for findLines()

This is resubmission of pull request #409

With default parameters.
Hough probabilistic transmission:
```python
lines = img.findLines()
```
![Untitled](https://f.cloud.github.com/assets/3843082/434267/09ad5752-af2f-11e2-853e-658c2c067f0a.png)
![Untitled4](https://f.cloud.github.com/assets/3843082/434271/09d6a350-af2f-11e2-94c0-37937c06deee.png)

Hough standard transmission:
```python
lines = img.findLines(useStandard=True)
```
![Untitled2](https://f.cloud.github.com/assets/3843082/434268/09ad23d6-af2f-11e2-936e-b9d430f60e9e.png)
![Untitled5](https://f.cloud.github.com/assets/3843082/434270/09d7a1d8-af2f-11e2-8f24-403cc805183e.png)

Hough standard transmission:
Added option 'maxpixelgap'. When bresenham_line return pixels, not every next pixel must be white, but some can be missed, so anyway consider them in the same line.
```python
lines = img.findLines(useStandard=True, maxpixelgap=2)
```
![Untitled3](https://f.cloud.github.com/assets/3843082/434269/09c4669a-af2f-11e2-8cf5-bc8234284108.png)
![Untitled6](https://f.cloud.github.com/assets/3843082/434272/09ed1658-af2f-11e2-8e5c-05d825130870.png)

Actually on complex images Hough standard transmission works much slower than probabilistic transmission.