Don't use extension to choose the compression format and check if file contains fastq data

[natir]

Actualy we use the last extension in filename to choose the compression format, we can replace it by read the magic number.

• gz : 1f 8b (2 bytes)
• bz2 : 'BZ' (16 bytes)
• xz : { 0xFD, '7', 'z', 'X', 'Z', 0x00 } (6 bytes)

For check if file is fastq just read the first character of first 4 lines -> @, [a-Z], +, [.]

[dridk]

This issue is related to #51 too. Could you manage this one too ?

[dridk]

Fixed Crash when you open xz file : 3d0cf565aa3b6b1bbed22fe8ae38492a5d6c60d8 Need to release a 0.2.2 version