added loan and loan installment

accounts/doctype/loan/loan.js

@@ -0,0 +1,18 @@
+$.extend(cur_frm.cscript, {
+	Generate: function(doc, dt, dn) {
+		cur_frm.cscript.clear_installments(doc);
+		for(var i=0; i< doc.no_of_installments; i++) {
+			d = LocalDB.add_child(doc, 'Loan Installment', 'installments');
+			d.amount = doc.loan_amount / doc.no_of_installments;
+			d.due_date = dateutil.add_months(doc.start_date, i+1);
+		}
+		cur_frm.refresh();
+	},
+	clear_installments: function(doc) {
+		$.each(getchildren('Loan Installment', doc.name, 'installments', 'Loan'), 
+			function(i, d) {
+				LocalDB.delete_doc('Loan Installment', d.name);
+			}
+		)
+	}
+})

accounts/doctype/loan/loan.py

@@ -0,0 +1,13 @@
+import webnotes
+from webnotes.model.doc import make_autoname, Document
+
+class DocType:
+	def __init__(self, doc, doclist):
+		self.doc, self.doclist = doc, doclist
+		
+	def autoname(self):
+		"""
+			Create Loan Id using naming_series pattern
+		"""
+		self.doc.name = make_autoname(self.doc.naming_series+ '.#####')
+		

accounts/doctype/loan/test_loan.py

@@ -0,0 +1,17 @@
+import unittest
+import webnotes
+from webnotes.model.code import get_obj
+
+class TestScheduleGeneartion(unittest.TestCase):
+	def setUp(self):
+		webnotes.conn.begin()
+		# create a mock loan
+		self.loan = get_obj('Loan', 'LOAN00001')
+		
+	def test_generation(self):
+		"test the genaration of loan installments"
+		self.loan.generate()
+		self.assertEqual(self.loan.get_installment_total(), self.loan.doc.loan_amount)
+		
+	def tearDown(self):
+		webnotes.conn.rollback()