Add dependencies to setup, fix file path issues

setup.py

@@ -13,5 +13,7 @@ setup(
     author_email="arcalinea@z.cash",
     license="MIT",
     url="http://github.com/zcash/xcat",
+    install_requires=['python-bitcoinlib', 'plyvel'],
+    dependency_links=['http://github.com/arcalinea/python-zcashlib/tarball/master'],
     packages=find_packages()
 )

xcat/protocol.py

@@ -7,7 +7,7 @@ from xcat.utils import *
 from xcat.trades import Contract, Trade
 import xcat.userInput as userInput
 import xcat.db as db
-from xcatconf import *
+from xcat.xcatconf import *
 
 def find_secret_from_fundtx(currency, p2sh, fundtx):
     if currency == 'bitcoin':

xcat/utils.py

@@ -89,7 +89,10 @@ def throw(err):
 #########  xcat.json temp file  #############
 #############################################
 
-xcatjson = os.path.join(ROOT_DIR, '.tmp/xcat.json')
+tmp_dir = os.path.join(ROOT_DIR, '.tmp')
+if not os.path.exists(tmp_dir):
+    os.makedirs(tmp_dir)
+xcatjson = os.path.join(tmp_dir, 'xcat.json')
 
 def save_trade(trade):
     with open(xcatjson, 'w+') as outfile:
@@ -104,8 +107,11 @@ def get_trade():
         return trade
 
 def erase_trade():
-    with open(xcatjson, 'w') as outfile:
-        outfile.write('')
+    try:
+        with open(xcatjson, 'w') as outfile:
+            outfile.write('')
+    except:
+        pass
 
 def save(trade):
     print("Saving trade")