Remove Mercurial vestiges

😢 I still love you, Mercurial.

.hgignore

@@ -1,7 +0,0 @@
-^dist/
-^beets\.egg-info/
-^build/
-^MANIFEST$
-^docs/_build/
-^\.tox/
-^\.idea/

.hgtags

@@ -1,29 +0,0 @@
-86681cf6e45cf8f8de36ffe4e543b8bdd0e92c70 1.0b2
-c367859a82b9f4db0a4e693db6e0cd9724f8f86d 1.0b1
-a5e6430ece5a806aae7e692bf274f700ba01c665 1.0b3
-127b1ca77a2b4d1bdff0fa2eac168684d7dfe29d 1.0b4
-7b14e7caeaeb15ccd3f280b8b745c9c8f1487b14 1.0b5
-fad79b29263e86815799d3049aaa2da5d4cd3a04 1.0b6
-5986215a08c24eea3eb48e1b13a4748b34040aa5 1.0b7
-cea5dcc51b047fa6535d535624363b50a991fb5b 1.0b8
-a256ec5b0b2de500305fd6656db0a195df273acc 1.0b9
-88807657483a916200296165933529da9a682528 1.0b10
-4ca1475821742002962df439f71f51d67640b91e 1.0b11
-284b58a9f9ce3a79f7d2bcc48819f2bb77773818 1.0b12
-b6c10981014a5b3a963460fca3b31cc62bf7ed2c 1.0b13
-d3dbc6df2b96f8ba5704305a893e3e63b7f9cd77 1.0b14
-618201431990382474829cf96ea58e3669159f9a 1.0b15
-c84744f4519be7416dc1653142f1763f406d6896 1.0rc1
-f3cd4c138c6f40dc324a23bf01c4c7d97766477e 1.0rc2
-6f29c0f4dc7025e8d8216ea960000c353886c4f4 v1.1.0-beta.1
-f28ea9e2ef8d39913d79dbba73db280ff0740c50 v1.1.0-beta.2
-8f070ce28a7b33d8509b29a8dbe937109bbdbd21 v1.1.0-beta.3
-97f04ce252332dbda013cbc478d702d54a8fc1bd v1.1.0
-b3f7b5267a2f7b46b826d087421d7f4569211240 v1.2.0
-b3f7b5267a2f7b46b826d087421d7f4569211240 v1.2.0
-ecff182221ec32a9f6549ad3ce8d2ab4c3e5568a v1.2.0
-bd7259ac13b54caecb1403f625688eb3eeeba8d6 v1.2.1
-c6af5962e25b915ce538af1c0b53a89ceb340b04 v1.2.2
-87945a0e217591a842307fa11e161d4912598c32 v1.3.0
-78ce7bd4a1d1ddcbbd2b624cdfcd70946640ae46 v1.3.1
-d3bb90ef6bc7f663f96dcc1bb5e46498662f16e7 v1.3.2