Api 2.0 support (#62)

* WIP - api 2.0

* WIP: update all 1.1 methods, and 2.0 methods with 1.1 overlap

* first crack at full 2.0

* update travis to run all tests under CI

* update the readme

* more documentation updates

* add get_candles method

.travis.yml

@@ -5,4 +5,4 @@ python:
 install:
   - pip install -r requirements.txt
 script:
-  - python -m unittest bittrex.test.bittrex_tests.TestBittrexPublicAPI
+  - python -m unittest bittrex.test.bittrex_tests

README.md

@@ -1,7 +1,7 @@
 python-bittrex  
 ==============
 
-[![Build Status](https://travis-ci.org/ericsomdahl/python-bittrex.svg?branch=travis-setup)](https://travis-ci.org/ericsomdahl/python-bittrex)
+[![Build Status](https://travis-ci.org/ericsomdahl/python-bittrex.svg?branch=master)](https://travis-ci.org/ericsomdahl/python-bittrex)
 
 Python bindings for bittrex.  I am Not associated -- use at your own risk, etc.
 
@@ -10,17 +10,19 @@ Tips are appreciated:
 * LTC: LaasG9TRa9p32noN2oKUVVqrDFp4Ja1NK3
 
 
-Example Usage
+Example Usage for Bittrex API
 -------------
 
 ```python
 from bittrex import Bittrex
 
-my_bittrex = Bittrex(None, None)
+my_bittrex = Bittrex(None, None, api_version=API_V2_0)  # or defaulting to v1.1 as Bittrex(None, None)
 my_bittrex.get_markets()
 {'success': True, 'message': '', 'result': [{'MarketCurrency': 'LTC', ...
 ```
 
+API_V2_0 and API_V1_1 are constants that can be imported from Bittrex.
+
 To access account methods, an API key for your account is required and can be 
 generated on the `Settings` then `API Keys` page. 
 Make sure you save the secret, as it will not be visible 
@@ -29,7 +31,7 @@ after navigating away from the page.
 ```python
 from bittrex import Bittrex
 
-my_bittrex = Bittrex("<my_api_key>", "<my_api_secret>")
+my_bittrex = Bittrex("<my_api_key>", "<my_api_secret>", api_version="<API_V1_1> or <API_V2_0>")
 
 my_bittrex.get_balance('ETH')
 {'success': True, 
@@ -39,6 +41,39 @@ my_bittrex.get_balance('ETH')
 }
 ```
 
+v1.1 constants of interest:
+---
+```
+BUY_ORDERBOOK = 'buy'
+SELL_ORDERBOOK = 'sell'
+BOTH_ORDERBOOK = 'both'
+```
+
+v2.0 constants of interest
+---
+These are used by get_candles()
+```
+TICKINTERVAL_ONEMIN = 'oneMin'
+TICKINTERVAL_FIVEMIN = 'fiveMin'
+TICKINTERVAL_HOUR = 'hour'
+TICKINTERVAL_THIRTYMIN = 'thirtyMin'
+TICKINTERVAL_DAY = 'Day'
+```
+these are used by trade_sell() and trade_buy()
+```
+ORDERTYPE_LIMIT = 'LIMIT'
+ORDERTYPE_MARKET = 'MARKET'
+
+TIMEINEFFECT_GOOD_TIL_CANCELLED = 'GOOD_TIL_CANCELLED'
+TIMEINEFFECT_IMMEDIATE_OR_CANCEL = 'IMMEDIATE_OR_CANCEL'
+TIMEINEFFECT_FILL_OR_KILL = 'FILL_OR_KILL'
+
+CONDITIONTYPE_NONE = 'NONE'
+CONDITIONTYPE_GREATER_THAN = 'GREATER_THAN'
+CONDITIONTYPE_LESS_THAN = 'LESS_THAN'
+CONDITIONTYPE_STOP_LOSS_FIXED = 'STOP_LOSS_FIXED'
+CONDITIONTYPE_STOP_LOSS_PERCENTAGE = 'STOP_LOSS_PERCENTAGE'
+```
 
 Testing
 -------