- pep8 edits for after effects script.

Bug fix. Lamps cone angle calculations returned error as import of pi has been removed. Now corrected the formula to match my new convention to use 'degrees' instead of 'pi'

Version 0.6.3: Changed the way of transfering rotations. Now Blender's rotation is represented by After Effects Orientation only by using ZYX euler rotation order. Not necessary to use AE's Rotation X property anymore

1. Added export of Blender's lamps as After Effects lights. Type of Blender's lamp is added to name of After Effects light    2. Added option to export static scene. In this case not necessary to go through each frame and refresh context    3. Added several conditions to prevent from adding unnecessary keyframes in After Effects. Values of properties that don't changed are set once and no keyframes are added

Added rotation_x correction to exported objects to match default zero rotation in After Effects. Objects with zero rotation in blender lay on the floor. In AE leyers with zero rotation face the camera. AE users are used to this behavior, so this change gives them a better feeling.

1. Fixed get_active_cam_for_each_frame(scene, start, end): Corrected checking markers.    2. Added displayStartTime on AE side to reflect exported range. It is just the way of displaying current tome in AE composition.

1. Fix for active camera export - when cameras bound to markers - option to export as one camera.    2. poll fix - changed from active object to active camera or selected objects    3. Export of active camera is now optional    4. Export of selected cameras is now optional    5. Naming fix - Changed tracking data export naming for user from BUNDLES to 3D MARKERS    6. Toolbar fix - wrapped in box, options added    7. Code cleanup - Prepared structure for future options of exporting lamps as AE lights, planes as AE solids and object tracking bundles, additional conditions added to avoid AE errors in some rare cases

1. Removed check if camera has attribute 'sensor size'. This option was needed for backwards compatibility. Not needed anymore 2. Moved adding composition's name from blender's toolbox to After Effects. User specifies name when running script in AE. 3. Added option to export selected objects' scale. 4. Rotation and scale export is now the option. User can include or exclude those properties. 5. Removed 'prefix' from AE's layers' names. This option was just creating mess. No real benefits from having this option 6. If no camera is selected - at least scene's camera will be exported (if exists)

In convert_lens() changed 'try' test to 'hasattr' test (Campbell Barton's suggestion, thank you), added '_' between prefix and ob_name to get more readable layers' names in AE, plus minor spelling corrections.

modified def convert_lens to behave correctly when camera sensor fit is set to vertical.\nPrevious version worked accurately only when 'AUTO' or 'HORIZONTAL' sensor fit was used.\nPreserved compatibility with 2.60a not supporting camera sensor size.