Update tests to match new emoji

Minor changes to emoji that appear as greyscale on some systems, with alternatives.

Bug fix to make HTML mode only appear any --html is used.

Add experimental support for a html output mode for inclusion in Galaxy

• Bugfix for biopython changes which removed Bio.Alphabet - which we imported but didn't actually use!

This was reported in #29 but was missed. Addresses issue #30

Bugfix for build process, switch to setuptools

• Update README

• Add custom dict example to README.md

Add test custom dictionary to repo

Major rewrite of fastqe as version 0.2.1 in July 2020:

• refactor code to support new options
• add long read support with --long
• add --noemoji for block-based output on systems that don't support emoji
• add --custom for user-defined mapping to emoji
• add --output to redirect to file instead of stdout
• add gzip support
• add redirect from stdin support
• fix bug of dropping position if some sequences are only 0 quality