fix #26, computeMatrix should not break when the first line of a peaks file is a comment or a track line
proposed patch for https://github.com/fidelram/deepTools/issues/25
removed links to manual folder
new figure for file formats
added check for empty bam file
Merge pull request #31 from fidelram/check_empty_file

fix for #25
Additional code for fix #26
Additional code for fix #26
Merge branch 'compute_matrix_track_lines_fix' of https://github.com/fidelram/deepTools into experimental