Changes to address Rob's comments. Added generic/event_triggered transformer, tests, and repo migrations for Burn and Mint events

db/migrations/20180911134701_create_token_burn_table.down.sql

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+DROP TABLE token_burns;

db/migrations/20180911134701_create_token_burn_table.up.sql

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+CREATE TABLE token_burns (
+  id                    SERIAL,
+  vulcanize_log_id      INTEGER NOT NULL UNIQUE,
+  token_name            CHARACTER VARYING(66) NOT NULL,
+  token_address         CHARACTER VARYING(66) NOT NULL,
+  burner                CHARACTER VARYING(66) NOT NULL,
+  tokens                DECIMAL NOT NULL,
+  block                 INTEGER NOT NULL,
+  tx                    CHARACTER VARYING(66) NOT NULL,
+  CONSTRAINT log_index_fk FOREIGN KEY (vulcanize_log_id)
+  REFERENCES logs (id)
+  ON DELETE CASCADE
+)

db/migrations/20180911134708_create_token_mint_table.down.sql

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+DROP TABLE token_mints;

db/migrations/20180911134708_create_token_mint_table.up.sql

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+CREATE TABLE token_mints (
+  id                    SERIAL,
+  vulcanize_log_id      INTEGER NOT NULL UNIQUE,
+  token_name            CHARACTER VARYING(66) NOT NULL,
+  token_address         CHARACTER VARYING(66) NOT NULL,
+  minter                CHARACTER VARYING(66) NOT NULL,
+  mintee                CHARACTER VARYING(66) NOT NULL,
+  tokens                DECIMAL NOT NULL,
+  block                 INTEGER NOT NULL,
+  tx                    CHARACTER VARYING(66) NOT NULL,
+  CONSTRAINT log_index_fk FOREIGN KEY (vulcanize_log_id)
+  REFERENCES logs (id)
+  ON DELETE CASCADE
+)