Clean up for 0.8 pre-release

Cleaned up unnecessary code, added small checks and writing proper
help.
Also provided one minimalistic example.

Author: SergioRAgostinho

examples/ex_01_minimal.m

@@ -0,0 +1,21 @@
+% FIVE_POINT_ALGORITHM - 
+% Example 1: minimal example
+%
+%   The point matches were extracted from two pictures taken with the same
+%   camera
+
+[path, ~, ~] = fileparts(which('ex_01_minimal'));
+addpath([path '/..']);
+clear path
+
+pts1 = [288.8398   12.1534  317.5059   74.5754   44.1327;
+        77.2382  163.7803   82.8476  220.5643  192.9634];
+
+pts2 = [286.1892    6.9846  312.5673   70.0283   40.2131;
+        76.7289  164.3921   81.3119  220.4840  194.1166];
+
+K = [602.5277   0           177.3328;
+     0          562.9129    102.8893;
+     0          0           1.0000];
+ 
+[E, Eo] = five_point_algorithm(pts1, pts2, K, K);